diff --git a/Dai So Tuyen Tinh/DSTT.h b/Dai So Tuyen Tinh/DSTT.h
new file mode 100644
index 0000000..1e79f7e
--- /dev/null
+++ b/Dai So Tuyen Tinh/DSTT.h	
@@ -0,0 +1,467 @@
+#ifndef DSTT_H_INCLUDED
+#define DSTT_H_INCLUDED
+
+#include <iostream>
+#include <cstdlib>
+#include <iomanip>
+#include <fstream>
+#include <sstream>
+#include <cstring>
+#include <string>
+
+using namespace std;
+
+class ma_tran
+{
+public:
+    int hang, cot;
+    double **phan_tu;
+
+    ma_tran()
+    {
+        this->hang = 0;
+        this->cot = 0;
+        this->phan_tu = NULL;
+    }
+
+    ma_tran(int m, int n)
+    {
+        this->hang = m;
+        this->cot = n;
+        phan_tu = new double*[this->hang];
+        for (int i = 0; i < this->hang; i++)
+        {
+            phan_tu[i] = new double[this->cot];
+        }
+    }
+
+    friend istream &operator >> (istream &input, ma_tran &m)
+    {
+        m.huy();
+        input >> m.hang >> m.cot;
+        m.phan_tu = new double* [m.hang];
+        for (int i = 0; i < m.hang; i++)
+        {
+            m.phan_tu[i] = new double[m.cot];
+        }
+        for (int i = 0; i < m.hang; i++)
+        {
+            for (int j = 0; j < m.cot; j++)
+            {
+                input >> m.phan_tu[i][j];
+            }
+        }
+        return input;
+    }
+
+    friend ostream &operator << (ostream &output, ma_tran &m)
+    {
+        for (int i = 0; i < m.hang; i++)
+        {
+            for (int j = 0; j < m.cot; j++)
+            {
+                output << setw(5) << m.phan_tu[i][j];
+            }
+            output << endl;
+        }
+        return output;
+    }
+
+    bool operator == (const ma_tran &m)
+    {
+        if (this->hang != m.hang || this->cot != m.cot)
+        {
+            return 0;
+        }
+        else
+        {
+            for (int i = 0; i < this->hang; i++)
+            {
+                for (int j = 0; j < this-> cot; j++)
+                {
+                    if (this->phan_tu[i][j] != m.phan_tu[i][j])
+                    {
+                        return 0;
+                    }
+                }
+            }
+        }
+        return 1;
+    }
+
+    ma_tran operator + (const ma_tran &m)
+    {
+        ma_tran mt(this->hang, this->cot);
+        if (this->hang == m.hang && this->cot == m.cot)
+        {
+            for (int i = 0; i < mt.hang; i++)
+            {
+                for (int j = 0; j < mt.cot; j++)
+                {
+                    mt.phan_tu[i][j] = this->phan_tu[i][j] + m.phan_tu[i][j];
+                }
+            }
+        }
+        else
+        {
+            mt.huy();
+        }
+        return mt;
+    }
+
+    ma_tran operator - (const ma_tran &m)
+    {
+        ma_tran mt(this->hang, this->cot);
+        if (this->hang == m.hang && this->cot == m.cot)
+        {
+            for (int i = 0; i < mt.hang; i++)
+            {
+                for (int j = 0; j < mt.cot; j++)
+                {
+                    mt.phan_tu[i][j] = this->phan_tu[i][j] - m.phan_tu[i][j];
+                }
+            }
+        }
+        else
+        {
+            mt.huy();
+        }
+        return mt;
+    }
+
+    ma_tran operator * (const ma_tran &m)
+    {
+        ma_tran mt(this->hang, m.cot);
+        if (this->cot == m.hang)
+        {
+            for (int i = 0; i < mt.hang; i++)
+            {
+                for (int j = 0; j < mt.cot; j++)
+                {
+                    mt.phan_tu[i][j] = 0;
+                    for (int k = 0; k < this->cot; k++)
+                    {
+                        mt.phan_tu[i][j] += this->phan_tu[i][k] * m.phan_tu[k][j];
+                    }
+                }
+            }
+        }
+        else
+        {
+            mt.huy();
+        }
+        return mt;
+    }
+
+    ma_tran duong_cheo_chinh()
+    {
+        ma_tran m(this->hang, this->cot);
+        for (int i = 0; i < this->hang; i++)
+        {
+            for (int j = 0; j < this->cot; j++)
+            {
+                if (i == j)
+                {
+                    m.phan_tu[i][j] = this->phan_tu[i][j];
+                }
+                else
+                {
+                    m.phan_tu[i][j] = 0;
+                }
+            }
+        }
+        return m;
+    }
+
+    ma_tran tam_giac_tren()
+    {
+        ma_tran m(this->hang, this->cot);
+        for (int i = 0; i < this->hang; i++)
+        {
+            for (int j = 0; j < this->cot; j++)
+            {
+                if (i <= j)
+                {
+                    m.phan_tu[i][j] = this->phan_tu[i][j];
+                }
+                else
+                {
+                    m.phan_tu[i][j] = 0;
+                }
+            }
+        }
+        return m;
+    }
+
+    ma_tran tam_giac_duoi()
+    {
+        ma_tran m(this->hang, this->cot);
+        for (int i = 0; i < this->hang; i++)
+        {
+            for (int j = 0; j < this->cot; j++)
+            {
+                if (i >= j)
+                {
+                    m.phan_tu[i][j] = this->phan_tu[i][j];
+                }
+                else
+                {
+                    m.phan_tu[i][j] = 0;
+                }
+            }
+        }
+        return m;
+    }
+
+    ma_tran don_vi()
+    {
+        ma_tran m(this->hang, this->cot);
+        for (int i = 0; i < this->hang; i++)
+        {
+            for (int j = 0; j < this->cot; j++)
+            {
+                if (i == j)
+                {
+                    m.phan_tu[i][j] = 1;
+                }
+                else
+                {
+                    m.phan_tu[i][j] = 0;
+                }
+            }
+        }
+        return m;
+    }
+
+    ma_tran chuyen_vi()
+    {
+        ma_tran m(this->cot, this->hang);
+        for (int i = 0; i < this->hang; i++)
+        {
+            for (int j = 0; j < this->cot; j++)
+            {
+                m.phan_tu[j][i] = this->phan_tu[i][j];
+            }
+        }
+        return m;
+    }
+
+    bool la_ma_tran_vuong()
+    {
+        if (this->hang == this->cot)
+        {
+            return 1;
+        }
+        else
+        {
+            return 0;
+        }
+    }
+
+    bool la_ma_tran_bac_thang()
+    {
+        int phan_tu_co_so = -1;
+        for (int i = 0; i < this->hang; i++)
+        {
+            int j = 0;
+            while (this->phan_tu[i][j] == 0)
+            {
+                j++;
+            }
+            if (j <= phan_tu_co_so && j != this->cot)
+            {
+                return 0;
+            }
+            else
+            {
+                phan_tu_co_so = j;
+            }
+        }
+        return 1;
+    }
+
+    bool la_ma_tran_doi_xung()
+    {
+        ma_tran m(this->hang, this->cot);
+        for (int i = 0; i < m.hang; i++)
+        {
+            for (int j = 0; j < m.cot; j++)
+            {
+                m.phan_tu[i][j] = this->phan_tu[i][j];
+            }
+        }
+        if (m == this->chuyen_vi())
+        {
+            return 1;
+        }
+        else
+        {
+            return 0;
+        }
+    }
+
+    bool la_ma_tran_phan_doi_xung()
+    {
+        ma_tran m(this->hang, this->cot);
+        for (int i = 0; i < m.hang; i++)
+        {
+            for (int j = 0; j < m.cot; j++)
+            {
+                m.phan_tu[i][j] = -this->phan_tu[i][j];
+            }
+        }
+        if (m == this->chuyen_vi())
+        {
+            return 1;
+        }
+        else
+        {
+            return 0;
+        }
+    }
+
+    double vet()
+    {
+        if (this->la_ma_tran_vuong())
+        {
+            double v = 0;
+            for (int i = 0; i < this->hang; i++)
+            {
+                v += this->phan_tu[i][i];
+            }
+            return v;
+        }
+        else
+        {
+            return 0;
+        }
+    }
+
+    void hang_x_nhan_y(int x, double y)
+    {
+        if (x >= 1 && x <= this->hang)
+        {
+            for (int j = 0; j < this->cot; j++)
+            {
+                this->phan_tu[x - 1][j] *= y;
+            }
+        }
+    }
+
+    void hang_x_cong_y_lan_hang_z(int x, double y, int z)
+    {
+        if (x >= 1 && x <= this->hang && z >= 1 && z <= this->hang)
+        {
+            for (int j = 0; j < this->cot; j++)
+            {
+                this->phan_tu[x - 1][j] += y*this->phan_tu[z - 1][j];
+            }
+        }
+    }
+
+    void doi_cho_2_hang(int x, int y)
+    {
+        if (x >= 1 && x <= this->hang && y >= 1 && y <= this->hang)
+        {
+            for (int j = 0; j < this->cot; j++)
+            {
+                int t = this->phan_tu[x - 1][j];
+                this->phan_tu[x - 1][j] = this->phan_tu[y - 1][j];
+                this->phan_tu[y - 1][j] = t;
+            }
+        }
+    }
+
+    void cot_x_nhan_y(int x, double y)
+    {
+        if (x >= 1 && x <= this->cot)
+        {
+            for (int i = 0; i < this->hang; i++)
+            {
+                this->phan_tu[i][x - 1] *= y;
+            }
+        }
+    }
+
+    void cot_x_cong_y_lan_cot_z(int x, double y, int z)
+    {
+        if (x >= 1 && x <= this->cot && z >= 1 && z <= this->cot)
+        {
+            for (int i = 0; i < this->hang; i++)
+            {
+                this->phan_tu[i][x - 1] += y*this->phan_tu[i][z - 1];
+            }
+        }
+    }
+
+    void doi_cho_2_cot(int x, int y)
+    {
+        if (x >= 1 && x <= this->cot && y >= 1 && y <= this->cot)
+        {
+            for (int i = 0; i < this->hang; i++)
+            {
+                int t = this->phan_tu[i][x - 1];
+                this->phan_tu[i][x - 1] = this->phan_tu[i][y - 1];
+                this->phan_tu[i][y - 1] = t;
+            }
+        }
+    }
+
+    ma_tran bac_thang()
+    {
+        ma_tran m(this->hang, this->cot);
+        for (int i = 0; i < m.hang; i++)
+        {
+            for (int j = 0; j < m.cot; j++)
+            {
+                m.phan_tu[i][j] = this->phan_tu[i][j];
+            }
+        }
+        int k = 0;
+        while (k < m.hang)
+        {
+            if (m.phan_tu[k][k] == 0)
+            {
+                for (int i = 0; i < this->hang; i++)
+                {
+                    if (m.phan_tu[i][k] != 0)
+                    {
+                        m.doi_cho_2_hang(k, i);
+                        break;
+                    }
+                }
+            }
+            for (int i = k + 1; i < m.hang; i++)
+            {
+                for (int j = k + 1; j < m.cot; j++)
+                {
+                    m.phan_tu[i][j] = m.phan_tu[i][j]*m.phan_tu[k][k] - m.phan_tu[i][k]*m.phan_tu[k][j];
+                }
+                m.phan_tu[i][k] = 0;
+            }
+            k++;
+        }
+        return m;
+    }
+
+    void huy()
+    {
+        if (phan_tu != NULL)
+        {
+            for (int i = 0; i < this->hang; i++)
+            {
+                if (phan_tu[i] != NULL)
+                {
+                    delete[] phan_tu[i];
+                    phan_tu[i] = NULL;
+                }
+            }
+            delete[] phan_tu;
+            phan_tu = NULL;
+        }
+    }
+
+    ~ma_tran(){}
+};
+
+#endif // DSTT_H_INCLUDED
diff --git a/Dai So Tuyen Tinh/main.cpp b/Dai So Tuyen Tinh/main.cpp
new file mode 100644
index 0000000..fa5d8ee
--- /dev/null
+++ b/Dai So Tuyen Tinh/main.cpp	
@@ -0,0 +1,13 @@
+#include "DSTT.h"
+
+int main()
+{
+    fstream f;
+    f.open("ma_tran.txt");
+    ma_tran mt;
+    f >> mt;
+    ma_tran m = mt.bac_thang();
+    cout << mt << endl;
+    cout << m << endl;
+    return 0;
+}
diff --git a/Project/1/1.docx b/Project/1/1.docx
new file mode 100644
index 0000000..4e769dc
Binary files /dev/null and b/Project/1/1.docx differ
diff --git a/Project/1/main.cpp b/Project/1/main.cpp
new file mode 100644
index 0000000..263c451
--- /dev/null
+++ b/Project/1/main.cpp
@@ -0,0 +1,60 @@
+#include <iostream>
+
+#define MAX_SIZE 10
+
+using namespace std;
+
+int main()
+{
+    int n;
+    cout << "Nhap n = ";
+    cin >> n;
+    while (cin.fail() || n < 0 || n > MAX_SIZE)
+    {
+        cin.clear();
+        cin.ignore(999, '\n');
+        cout << "Nhap khong thoa yeu cau! Vui long nhap lai: n = ";
+        cin >> n;
+    }
+    cout << endl;
+    int i, j, a = 0, chi_so_i = 0, chi_so_j = 0, chieu_dai = n - 1, mang[MAX_SIZE][MAX_SIZE];
+    while (a < n*n)
+    {
+        if (chieu_dai == 0)
+        {
+            mang[n/2][n/2] = ++a;
+        }
+        for (j = chi_so_j; j - chi_so_j < chieu_dai; j++)
+        {
+            mang[chi_so_i][j] = ++a;
+        }
+        chi_so_j = j;
+        for (i = chi_so_i; i - chi_so_i < chieu_dai; i++)
+        {
+            mang[i][chi_so_j] = ++a;
+        }
+        chi_so_i = i;
+        for (j = chi_so_j; chi_so_j - j < chieu_dai; j--)
+        {
+            mang[chi_so_i][j] = ++a;
+        }
+        chi_so_j = j;
+        for (i = chi_so_i; chi_so_i - i < chieu_dai; i--)
+        {
+            mang[i][chi_so_j] = ++a;
+        }
+        chi_so_j = j + 1;
+        chi_so_i = i + 1;
+        chieu_dai -= 2;
+    }
+
+    for (i = 0; i < n; i++)
+    {
+        for (j = 0; j < n; j++)
+        {
+            cout << mang[i][j] << '\t';
+        }
+        cout << endl;
+    }
+    return 0;
+}
diff --git a/Project/2/2.docx b/Project/2/2.docx
new file mode 100644
index 0000000..36b34fe
Binary files /dev/null and b/Project/2/2.docx differ
diff --git a/Project/2/main.cpp b/Project/2/main.cpp
new file mode 100644
index 0000000..6fc813f
--- /dev/null
+++ b/Project/2/main.cpp
@@ -0,0 +1,95 @@
+#include <iostream>
+#include <cmath>
+
+using namespace std;
+
+void xu_ly(int n)
+{
+    int i, j, m = 0, vong = ceil(n/2), chi_so_i = 0, chi_so_j = 0, chieu_dai = n - 1, a[n][n], b[n][n];
+    bool chan = 0;
+    for (i = 0; i < n; i++)
+    {
+        for (j = 0; j < n; j++)
+        {
+            a[i][j] = ++m;
+        }
+    }
+    while (vong)
+    {
+        if (chan)
+        {
+            for (j = chi_so_j; j - chi_so_j < chieu_dai; j++)
+            {
+                b[chi_so_i][j] = a[chi_so_i][j + 1];
+            }
+            chi_so_j = j;
+            for (i = chi_so_i; i - chi_so_i < chieu_dai; i++)
+            {
+                b[i][chi_so_j] = a[i + 1][chi_so_j];
+            }
+            chi_so_i = i;
+            for (j = chi_so_j; chi_so_j - j < chieu_dai; j--)
+            {
+                b[chi_so_i][j] = a[chi_so_i][j - 1];
+            }
+            chi_so_j = j;
+            for (i = chi_so_i; chi_so_i - i < chieu_dai; i--)
+            {
+                b[i][chi_so_j] = a[i - 1][chi_so_j];
+            }
+        }
+        else
+        {
+            for (i = chi_so_i; i - chi_so_i < chieu_dai; i++)
+            {
+                b[i][chi_so_j] = a[i + 1][chi_so_j];
+            }
+            chi_so_i = i;
+            for (j = chi_so_j; j - chi_so_j < chieu_dai; j++)
+            {
+                b[chi_so_i][j] = a[chi_so_i][j + 1];
+            }
+            chi_so_j = j;
+            for (i = chi_so_i; chi_so_i - i < chieu_dai; i--)
+            {
+                b[i][chi_so_j] = a[i - 1][chi_so_j];
+            }
+            chi_so_i = i;
+            for (j = chi_so_j; chi_so_j - j < chieu_dai; j--)
+            {
+                b[chi_so_i][j] = a[chi_so_i][j - 1];
+            }
+        }
+        chi_so_i = i + 1;
+        chi_so_j = j + 1;
+        chieu_dai -= 2;
+        chan = !chan;
+        vong--;
+        if (chieu_dai == 0)
+        {
+            b[n/2][n/2] = a[n/2][n/2];
+        }
+    }
+    for (i = 0; i < n; i++)
+    {
+        for (j = 0; j < n; j++)
+        {
+            cout << b[i][j] << '\t';
+        }
+        cout << endl;
+    }
+}
+
+int main()
+{
+    int n;
+    cin >> n;
+    while (cin.fail() || n < 0)
+    {
+        cin.clear();
+        cin.ignore(999, '\n');
+        cin >> n;
+    }
+    xu_ly(n);
+    return 0;
+}
diff --git a/Project/3/3.docx b/Project/3/3.docx
new file mode 100644
index 0000000..b08599a
Binary files /dev/null and b/Project/3/3.docx differ
diff --git a/Project/3/main.cpp b/Project/3/main.cpp
new file mode 100644
index 0000000..3fb0da3
--- /dev/null
+++ b/Project/3/main.cpp
@@ -0,0 +1,155 @@
+#include <iostream>
+#include <cmath>
+
+using namespace std;
+
+typedef struct
+{
+    int tu, mau;
+} phan_so;
+
+void nhap(phan_so &x)
+{
+    cout << "Tu = ";
+    cin >> x.tu;
+    while (cin.fail())
+    {
+        cin.clear();
+        cin.ignore(999, '\n');
+        cout << "Nhap loi! Tu = ";
+        cin >> x.tu;
+    }
+    cout << "Mau = ";
+    cin >> x.mau;
+    while (cin.fail() || x.mau == 0)
+    {
+        cin.clear();
+        cin.ignore(999, '\n');
+        cout << "Nhap loi! Mau = ";
+        cin >> x.mau;
+    }
+}
+
+int gcd(int a, int b)
+{
+    a = abs(a);
+    b = abs(b);
+    if (a%b == 0)
+    {
+        return b;
+    }
+    else
+    {
+        if (b > a)
+        {
+            return gcd(b, a);
+        }
+        else
+        {
+            return gcd(b, a%b);
+        }
+    }
+}
+
+void toi_gian(phan_so &x)
+{
+    int t = gcd(x.tu, x.mau);
+    x.tu /= t;
+    x.mau /= t;
+    if (x.mau < 0)
+    {
+        x.tu *= -1;
+        x.mau *= -1;
+    }
+}
+
+void xuat(phan_so x)
+{
+    cout << x.tu;
+    if (x.mau != 1)
+    {
+        cout << "/" << x.mau;
+    }
+}
+
+phan_so cong(phan_so a, phan_so b)
+{
+    phan_so t;
+    t.tu = a.tu*b.mau + a.mau*b.tu;
+    t.mau = a.mau*b.mau;
+    return t;
+}
+
+phan_so tru(phan_so a, phan_so b)
+{
+    phan_so t;
+    t.tu = a.tu*b.mau - a.mau*b.tu;
+    t.mau = a.mau*b.mau;
+    return t;
+}
+
+phan_so nhan(phan_so a, phan_so b)
+{
+    phan_so t;
+    t.tu = a.tu*b.tu;
+    t.mau = a.mau*b.mau;
+    return t;
+}
+
+phan_so chia(phan_so a, phan_so b)
+{
+    phan_so t;
+    t.tu = a.tu*b.mau;
+    t.mau = a.mau*b.tu;
+    return t;
+}
+
+int main()
+{
+    phan_so a, b, tong, hieu, tich, thuong;
+    cout << "Nhap tu va mau cua phan so a:" << endl;
+    nhap(a);
+    toi_gian(a);
+
+    cout << "Nhap tu va mau cua phan so b:" << endl;
+    nhap(b);
+    toi_gian(b);
+
+    cout << endl << "a = ";
+    xuat(a);
+    cout << endl << "b = ";
+    xuat(b);
+    cout << endl;
+
+    tong = cong(a, b);
+    toi_gian(tong);
+    cout << "a + b = ";
+    xuat(tong);
+    cout << endl;
+
+    hieu = tru(a, b);
+    toi_gian(hieu);
+     cout << "a - b = ";
+    xuat(hieu);
+    cout << endl;
+
+    tich = nhan(a, b);
+    toi_gian(tich);
+    cout << "a*b = ";
+    xuat(tich);
+    cout << endl;
+
+    if (b.tu != 0)
+    {
+        thuong = chia(a, b);
+        toi_gian(thuong);
+        cout << "a/b = ";
+        xuat(thuong);
+        cout << endl;
+    }
+    else
+    {
+        cout << "Phan so b = 0 nen khong the thuc hien phep chia!" << endl;
+    }
+    return 0;
+}
diff --git a/Project/4/4.docx b/Project/4/4.docx
new file mode 100644
index 0000000..8af7c29
Binary files /dev/null and b/Project/4/4.docx differ
diff --git a/Project/4/main.cpp b/Project/4/main.cpp
new file mode 100644
index 0000000..64abb65
--- /dev/null
+++ b/Project/4/main.cpp
@@ -0,0 +1,52 @@
+#include <stdio.h>
+#include <assert.h>
+void DrawSpiralLine(const int n, const int line)
+{
+    // Throw an assertion when faulty parameters are supplied.
+    assert(line >= 0 && line < n && n > 0);
+    const int square = n * n;
+    int       i      = 0;
+    // Simple case: The first line of a spiral.
+    if (line == 0)
+    {
+        for (i = 0; i < n; i++)
+        {
+            printf("%02d ", (square - 1) - i);
+        }
+    }
+    // Simple case: The last line of a spiral.
+    else if (line == (n - 1))
+    {
+        for (i = 0; i < n; i++)
+        {
+            printf("%02d ", square - (3 * n) + 2 + i);
+        }
+    }
+    // Complex case: Line with other inner spirals.
+    else
+    {
+        // Print the first character.
+        printf("%02d ", square - (4 * n) + 4 + (line - 1));
+        // Print a line of the rest
+        DrawSpiralLine(n - 2, line - 1);
+        // Print the last character
+        printf("%02d ", (square - 1) - n - (line - 1));
+    }
+}
+void DrawSpiral(const int n)
+{
+    int i = 0;
+    // Draw the lines of the spiral.
+    for (i = 0; i < n; i++)
+    {
+        DrawSpiralLine(n, i);
+        printf("\n");
+    }
+}
+int main(void)
+{
+    DrawSpiral(5);
+    printf("\n");
+    DrawSpiralLine(6, 2);
+    return 0;
+}
diff --git a/Project/5/5.docx b/Project/5/5.docx
new file mode 100644
index 0000000..0224266
Binary files /dev/null and b/Project/5/5.docx differ
diff --git a/Project/5/main.cpp b/Project/5/main.cpp
new file mode 100644
index 0000000..00e02b4
--- /dev/null
+++ b/Project/5/main.cpp
@@ -0,0 +1,41 @@
+#include <iostream>
+
+using namespace std;
+
+int main()
+{
+    int n;
+    cout << "Nhap so phan tu cua mang: ";
+    cin >> n;
+    int arr[n][n] = {0};
+    for (int i = 0; i < n; i++)
+    {
+        cin >> arr[0][i];
+    }
+    for (int i = 1; i < n; i++)
+    {
+        for (int j = 0; j < n - i; j++)
+        {
+            arr[i][j] = arr[i - 1][j] + arr[0][i + j];
+        }
+    }
+    int max = arr[0][0], chi_so_i = 0, chi_so_j = 0;
+    for (int i = 0; i < n; i++)
+    {
+        for (int j = 0; j < n - i; j++)
+        {
+            if (arr[i][j] >= max)
+            {
+                max = arr[i][j];
+                chi_so_i = i;
+                chi_so_j = j;
+            }
+        }
+    }
+    for (int i = chi_so_j; i <= chi_so_i + chi_so_j; i++)
+    {
+        cout << arr[0][i] << "\t";
+    }
+    cout << endl << max << endl;
+    return 0;
+}