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[2(x-1)^2+(x-1)^3]÷(1-x)
人气:263 ℃ 时间:2020-03-31 17:02:14
解答
[2(x-1)^2+(x-1)^3]÷(1-x)
=[2(1-x)^2-(1-x)^3]÷(1-x)
=2(1-x)-(1-x)^2
=1-x^2
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