Răspuns:
ex 5.
a) 3 × (5 + 4) = 3 × 5 + 3 × 4
4 × 3 + 4 × 2 = 4 × (3 + 2)
b) 4 × 3 × 4 × 2 = 4 × 5
2 × 8 - 2 × 6 = 2 × 2
a) 5 × (3 + 7) = 5 × 3 + 5 × 7
4 × 7 + 4 × 3 = 4 × (7 + 3)
b) 8 × (1 + 5) = 1 × 0 + 8 × 5
5 × (3 + 5) = 5 × 3 + 5 × 5
Ex.5
a)3×(5-4)=3×5-3×4
a)4×3-4×2=4×(3-2)
b)4x3+4×2=4×5
b)2×8-2×6=2+2
Ex 8.
a)5×(3+7)=5×3+5×7
a)4×7+4×3=4×(7+3)
b)8×(3+5)=8×3+8×5
b)3×(3+4)=3×3+3×4
