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25x的二次方-10x(x-y)+(x-y)的2次方
人气:464 ℃ 时间:2020-03-27 22:09:59
解答
25x^2-10x(x-y)+(x-y)^2
=[5x-(x-y)]^2
=(5x-x+y)^2
=(4x+y)^2
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