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F.2Maths!!!!!!!!!!!10p!!!!!!

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6a)(x-2y)^2-16(x-2y) b)(ab+c)^2-25(ab+c)^2 c)5a(b+c)-125(b+c)^2 d)x(y+1)^2-4xy-4x

最佳解答:

6a) (x-2y)^2-16(x-2y) 抽common factor (x-2y) = (x-2y) (x-2y-16) b) (ab+c)^2-25(ab+c)^2 = (ab+c)^2 (1-25) = -24 (ab+c)^2 c)5a(b+c)-125(b+c)^2 = 5(b+c) [a-25(b+c)] d)x(y+1)^2-4xy-4x = x (y+1)^2 - 4x (y+1) = x (y+1) (y+1-4x)

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