Ответы на вопрос:
a) (a-x)(x-y)(x+y) - (x-y)(a-x)(a+x) = (a-x)(x-y)(x+y-a-x) = (a-x)(x-y)(y-a)
б) (a-x)(x-y)(x^2+xy+y^2) - (x-y)(a-x)(a^2+ax+x^2) = (a-x)(x-y)(x^2+xy+y^2-a^2-ax-x^2)= (a-x)(x-y)(xy+y^2-a^2-ax)
в) (x^2-2x+1) - 25 = (x-1)^2 - 25 = (x-1-5)(x-1+5) = (x-6)(x+4)
г) (a^2+8a+16) - 1 = (a+4)^2 - 1 = (a+4-1)(a+4+1) = (a+3)(a+5)
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