Автор - fjdjdsjfj

умоляю помогите пж пж

Ответ

Автор - morganaD

1) (x-y)(x+y) + (x-y) = (x-y)(x+y+1)

2) (2x-y)^{2} - 9 = (2x-y-3)(2x-y+3)

3)c^{4} (a-1) - c^{2} (a-1) = (a-1)(c^{4} - c^{2}) = (a-1)(c^{2} - c)(c^{2} + c)

4)4 - (m^{2} - 2mn +n^{2}) = 4 - (m-n)^{2}  = (2-m+n)(2+m-n)

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