Răspuns:
Explicație pas cu pas:
15 × (13 + 12) = 15 × 25 = 375
15 × (13 + 12) = 15 × 13 + 15 × 12 = 195 + 180 = 375
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4 × (70 - 20) = 4 × 50 = 200
4 × (70 - 20) = 4 × 70 - 4 × 20 = 280 - 80 = 200
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23 × (20 + 6) = 23 × 26 = 598
23 × (20 + 6) = 23 × 20 + 23 × 6 = 460 + 138 = 598