#331
1) 13+65 =78 11+54=65 78-65=13
2) а+86 91 а+86-91=а-5
3) 181+b 195-x 181+b-195+x= x+b-14
4) x-16 y-24 x-16-y+24=x-y+8
#330
1) 256-16 3+14 256-16=240 3+14=17 240-17 = 223
2) a+98 49 a+98-49= a+49
3)x+32 y+13 x+32-y-13= x-y+9
4) m-98 n+56 m-98-n-56= m-n-154