Răspuns:
a). 3 × (2+5)= 3 × 7 = 21
3 × 2 + 3 × 5 = 6 + 15 = 21
b). 5 × (8-3) = 5 × 5 = 25
5 × 8 - 5 × 3 = 40 - 15 = 25
c). 4 × (4+5) = 4 × 9 = 36
4 × 4 + 4 × 5 = 16 + 20 = 36
d). (9-6) × 9 = 3 × 9 = 27
9 × 9 - 9 × 6 = 81 - 54 = 27
