a) 100 + (156-7×8) : 5= 100 + (156-56) : 5 = 100 + 100 : 5 = 100 + 20 = 120.
b) 200 - (28+9×8) ÷ 4 = 200 - (28+72) : 4 = 200 - 100 : 4 = 200 - 25 = 175.
c) 1000 - (162-6×7) ÷ 8 = 1000 - (162-42) : 8 = 1000 - 120 : 8 = 1000 - 15 = 985.
d) 650 + (133-7×9 ) ÷ 7 = 650 + (133-63) : 7 = 650 + 70 : 7 = 650 + 10 = 660.
