Răspuns:
Explicație pas cu pas:
3 × 3 = 9
6 × 3 = 2 × 3 × 3 = 2 × 9 = 18
= 9 + 9 = 18
9 × 3 = 3 × 3 × 3 = 3 × 9 = 27
= 9 + 9 + 9 = 27
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3 × 5 = 15
6 × 5 = 2 × 3 × 5 = 2 × 15 = 30
= 15 + 15 = 30
9 × 5 = 3 × 3 × 5 = 3 × 15 = 45
= 15 + 15 + 15 = 45