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数学
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﹙x-2y﹚²-4x+8y+4
人气:365 ℃ 时间:2020-03-22 18:35:47
解答
﹙x-2y﹚²-4x+8y+4
=﹙x-2y﹚²-4(x-2y)+4
=﹙x-2y-2﹚²
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