Ответ:
7(a-1)(b+3)
Объяснение:
7ab+21a-7b-21 = (7ab+21a)-(7b+21) = 7a(b+3)-7(b+3) = (7a-7)(b+3) = 7(a-1)(b+3)
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Ответ:
7(a-1)(b+3)
Объяснение:
7ab+21a-7b-21 = (7ab+21a)-(7b+21) = 7a(b+3)-7(b+3) = (7a-7)(b+3) = 7(a-1)(b+3)