Ответ:
7. 7ab(3a+4b)
8.-3x^6(1-4x^6)
9.4a^2(1-2a+3a^2)
10.3mn(3m^2n+3m-6n)
11.2x^2(13x-7y+4)
12.-5abc(3a^2b^2+2abc+1bc)
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Ответ:
7. 7ab(3a+4b)
8.-3x^6(1-4x^6)
9.4a^2(1-2a+3a^2)
10.3mn(3m^2n+3m-6n)
11.2x^2(13x-7y+4)
12.-5abc(3a^2b^2+2abc+1bc)