3))90-40-30=20 Кустов
4))10:5=2 9:3=3 12:6=2
8:2=4 6:2=3 14:7=2
Элементарно
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3))90-40-30=20 Кустов
4))10:5=2 9:3=3 12:6=2
8:2=4 6:2=3 14:7=2
Элементарно