9. Какие равенства верны? 1. 12х - 6у = 6(2х - у) 2. -4а - 12b = -4(а - 3b) 3. 8m - 12n = 4(2m - Зn) 4. -3b + 6c = -3(b – 2с) 5. 6x - 24y = 6(x-3y) 6. - 15m + 25n = 5(3m – 5n) А) 1, 3, 4 B) 2, 3, 5 C) 2, 5, 6 D) 1, 4, 6​
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