fasm_laba_1

                org 100h
start:
                mov ah, $09
                mov dx, str1
                int 21h

                mov ah, $02
                mov dx, 0x0D0A
                int 21h

                mov ah, $09
                mov dx, str2
                int 21h

                mov ah, $02
                mov dx,  0x0D0A
                int 21h

                mov ah, $09
                mov dx, str3
                int 21h

                mov ax, [c]
                sub ax, [b]

                mov bx, $2
                mul bx
                mov bx, ax

                mov ax, [a]
                mov cx, $2
                mul cx

                add bx, ax

                mov ax, [d]
                add ax, $3

                xchg ax, bx

                div bx

                mov [res], ax

                mov ax, [res]
                add ax, '0'  ; òàêîé âûâîä ìîæåò êîððåêòíî âûâåñòè òîëüêî ÷èñëà îò 0 äî 9

                mov dx,ax
                mov ah, $02
                int 21h

                mov ah,$08
                int 21h

                ret

str1            db '(2a + (c - b) * 2)/(d + 3)$'
str2            db 'a = 2, b = 4, c = 6, d = 1$'
str3            db 'result: $'
a               dw 2h
b               dw 4h
c               dw 6h
d               dw 1h
res             dw 0