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数学
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x^2-1/x^2+4x+4÷(x+1)×x^2+3x+2/x-1计算
人气:149 ℃ 时间:2020-05-20 05:06:57
解答
=(x+1)(x-1)/(x+2)²×1/(x+1)×(x+2)(x+1)/(x-1)
=(x+1/(x+2)
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