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25(x-y)2+10(y-x)+1.
人气:217 ℃ 时间:2020-04-17 18:21:16
解答
25(x-y)2+10(y-x)+1
=[5(x-y)]2-2×1×5(x-y)+12
=[5(x-y)-1]2
=(5x-5y-1)2
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