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数学
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x²-10x+25/x²-25约分
人气:216 ℃ 时间:2020-03-30 04:49:08
解答
﹙x²-10x+25﹚/﹙x²-25﹚
=﹙x-5﹚²/[﹙x+5﹚﹙x-5﹚]
=﹙x-5﹚/﹙x+5﹚
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