СРОЧНО!!!! Якому многочлену тотожно дорівнює вираз -7ab+(5a+b)*(2b-3a)
А) -15a^2-14ab+2b^2
Б) -15a^2+2b^2+3ab
В) -15a^2+6ab+2b^2
Г) 15a^2+2b^2
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