3
a) 4 × 97 × 250 = 4× 250 × 97 = 1000 ×97 = 97000
b) 76 × 7 + 24 × 7 = 532 + 168 = 700
c) 93 × 185 × 0 × 42 = 0
4
a) 86 + 29 × 2 = 86 + 58 = 144
b) 84 - 23 ×3 +84 = 84 - 69 + 84 = 15 + 84 = 99
c) 125 + ( 64 -9 ) × 12 = 125 + 55 × 12 = 125 + 660 = 785
