Ответы на вопрос:
А) a(a+b)-b(a-b) = (a-b)(a+b)(a-b)б)2x(x-y)-y(y-2x) = (2x-y)(x-y)(y-2x) = (y-x)(2x-y)(2x-y) = (y-x)(2x-y)² в)a(a² -1)+a² (a-1) = (a+a²)(a-1)(a+1)(a-1) = a(1+a)(a-1)(a+1)(a-1) a(a²-1)² г)4m(m-² -8) = 4m(m-2) - 4m(m-2) = 0д)2(x² -7)+(7-2x² ) = 2x² - 14 + 7 - 2x² = -7 е)3x(x-y)+3y(x+y) = 3x+3y (x-y)(x+y) = 3(x+y)(x-y)(x+y)
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