Masm, laba1

.model small

.stack 256h

.data
      x1 dw 10
      x2 dw -420
      x3 dw 462
      x4 dw -42

result1 dw 0
result2 dw 0
result3 dw 0
result4 dw 0

.code

main proc

      mov ax, @data
	mov ds, ax

push x1

mov ax, x2
imul ax, x4

mov result1, ax

mov ax, x3
sub ax, x1

mov result2, ax

mov ax, x3
shl ax, 8

mov result3, ax

mov ax, x2
xor ax, x3

mov result4, ax

      mov ax, 4c00h
	int 21h

main endp
end main