diff --git a/KTMT/Lab2_2/1.asm b/KTMT/Lab2_2/1.asm
new file mode 100644
index 0000000..bfadb96
--- /dev/null
+++ b/KTMT/Lab2_2/1.asm
@@ -0,0 +1,21 @@
+	.data
+a:	.word	0
+i:	.asciiz	"Input a: "
+t:	.asciiz	"Computer Architecture is so easy!"
+f:	.asciiz	"you are right!"
+	.text
+	.globl	main
+main:
+	la	$a0, i
+	li	$v0, 4
+	syscall
+	li	$v0, 5
+	syscall
+	bgez	$v0, true
+	la	$a0, f
+	j	exit
+true:	la	$a0, t
+exit:	li	$v0, 4
+	syscall
+	li	$v0, 10
+	syscall
\ No newline at end of file
diff --git a/KTMT/Lab2_2/2.asm b/KTMT/Lab2_2/2.asm
new file mode 100644
index 0000000..4c7e440
--- /dev/null
+++ b/KTMT/Lab2_2/2.asm
@@ -0,0 +1,46 @@
+	.data
+a:	.word	0
+b:	.word	0
+c:	.word	0
+nhap_a:	.asciiz	"Nhap a: "
+nhap_b:	.asciiz	"Nhap b: "
+nhap_c:	.asciiz	"Nhap c: "
+xuat_a:	.asciiz	"Ket qua a = "
+	.text
+	.globl	main
+main:
+	la	$a0, nhap_a
+	li	$v0, 4
+	syscall
+	li	$v0, 5
+	syscall
+	sw	$v0, a
+	la	$a0, nhap_b
+	li	$v0, 4
+	syscall
+	li	$v0, 5
+	syscall
+	sw	$v0, b
+	la	$a0, nhap_c
+	li	$v0, 4
+	syscall
+	li	$v0, 5
+	syscall
+	sw	$v0, c
+	lw	$s0, a
+	lw	$s1, b
+	lw	$s2, c
+	blt	$s0, -5, false
+	bgt	$s0, 5, false
+	add	$s0, $s1, $s2
+	j	exit
+false:	sub	$s0, $s1, $s2
+exit:	sw	$s0, a
+	la	$a0, xuat_a
+	li	$v0, 4
+	syscall
+	lw	$a0, a
+	li	$v0, 1
+	syscall
+	li	$v0, 10
+	syscall
\ No newline at end of file
diff --git a/KTMT/Lab2_2/3.asm b/KTMT/Lab2_2/3.asm
new file mode 100644
index 0000000..f0f88d1
--- /dev/null
+++ b/KTMT/Lab2_2/3.asm
@@ -0,0 +1,70 @@
+	.data
+in:	.word	0
+a:	.word	0
+b:	.word	0
+c:	.word	0
+in_in:	.asciiz	"Nhap input: "
+in_b:	.asciiz	"Nhap b: "
+in_c:	.asciiz	"Nhap c: "
+err:	.asciiz	"Gia tri nhap vao khong hop le!"
+out_a:	.asciiz "Gia tri cua a la: "
+	.text
+	.globl	main
+main:
+	la	$a0, in_in
+	li	$v0, 4
+	syscall
+	li	$v0, 5
+	syscall
+	sw	$v0, in
+	la	$a0, in_b
+	li	$v0, 4
+	syscall
+	li	$v0, 5
+	syscall
+	sw	$v0, b
+	la	$a0, in_c
+	li	$v0, 4
+	syscall
+	li	$v0, 5
+	syscall
+	sw	$v0, c
+	lw	$s0, in
+	lw	$s1, b
+	lw	$s2, c
+	beq	$s0, 0, case_1
+	beq	$s0, 1, case_2
+	beq	$s0, 2, case_3
+	beq	$s0, 3, case_4
+error:	la	$a0, err
+	li	$v0, 4
+	syscall
+	j	exit
+case_1:
+	add	$s3, $s1, $s2
+	j	out
+case_2:
+	sub	$s3, $s1, $s2
+	j	out
+case_3:
+	add	$t0, $s1, $zero
+	li	$s3, 0
+loop:	beqz	$t0, out
+	add	$s3, $s3, $s2
+	addi	$t0, $t0, -1
+	j	loop
+case_4:
+	beqz	$s2, error
+	addi	$s3, $zero, 0
+	addi	$t0, $s2, 0
+loop2:	bgt	$t0, $s1, out
+	add	$t0, $t0, $s2
+	addi	$s3, $s3, 1
+	j	loop2
+out:	
+	sw	$s3, a
+	lw	$a0, a
+	li	$v0, 1
+	syscall
+exit:	li	$v0, 10
+	syscall
diff --git a/KTMT/Lab2_2/4.asm b/KTMT/Lab2_2/4.asm
new file mode 100644
index 0000000..b784494
--- /dev/null
+++ b/KTMT/Lab2_2/4.asm
@@ -0,0 +1,42 @@
+	.data
+nhap:	.asciiz	"Nhap n: "
+loi:	.asciiz	"Gia tri nhap vao khong hop le!"
+xuat:	.asciiz "F(n) = "
+	.text
+	.globl	main
+main:
+	la	$a0, nhap
+	li	$v0, 4
+	syscall
+	li	$v0, 5
+	syscall
+	move	$s0, $v0
+	bltz	$s0, error
+	la	$a0, xuat
+	li	$v0, 4
+	syscall
+	ble	$s0, 1, out_01
+	addi	$t0, $zero, 2
+	li	$t1, 0
+	li	$t2, 1
+	add	$t3, $t1, $t2
+loop:	bge	$t0, $s0, out
+	move	$t1, $t2
+	move	$t2, $t3
+	add	$t3, $t1, $t2
+	addi	$t0, $t0, 1
+	j	loop
+error:
+	la	$a0, loi
+	li	$v0, 4
+	syscall
+	j	exit
+out_01:	move	$a0, $s0
+	li	$v0, 1
+	syscall
+	j	exit
+out:	move	$a0, $t3
+	li	$v0, 1
+	syscall
+exit:	li	$v0, 10
+	syscall
\ No newline at end of file
diff --git a/KTMT/Lab2_2/5.asm b/KTMT/Lab2_2/5.asm
new file mode 100644
index 0000000..fdde8e2
--- /dev/null
+++ b/KTMT/Lab2_2/5.asm
@@ -0,0 +1,30 @@
+	.data
+found:	.asciiz	"Tim thay ky tu tai vi tri: "
+chrArr:	.asciiz	"Computer Architecture CSE-HCMUT"
+chr:	.word	'e'
+pos:	.word	0
+	.text
+	.globl	main
+main:
+	la	$a0, found
+	li	$v0, 4
+	syscall
+	la	$a0, chrArr
+	addi	$t1, $zero, 0
+	lw	$t2, chr
+while:
+	add	$a1, $a0, $t1
+	lb	$t0, 0($a1)
+	beq	$t0, $t2, done
+	beq	$t0, $zero, null
+	addi	$t1, $t1, 1
+	j	while
+null:
+	li	$t1, -1
+done:
+	move	$a0, $t1
+	li	$v0, 1
+	syscall
+exit:
+	li	$v0, 10
+	syscall
diff --git a/KTMT/Lab2_2/putsString.asm b/KTMT/Lab2_2/putsString.asm
new file mode 100644
index 0000000..310cc20
--- /dev/null
+++ b/KTMT/Lab2_2/putsString.asm
@@ -0,0 +1,17 @@
+	.data
+string:	.asciiz	"Day la chuoi can xuat!"
+	.text
+	.globl	main
+main:
+	li	$v0, 11
+	la	$t1, string
+while:
+	lb	$a0, 0($t1)
+	beq	$a0, $zero, exit
+	syscall
+	addi	$t1, $t1, 1
+	j	while
+exit:
+	li	$v0, 10
+	syscall
+