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3(x+1)^2-5(x+1)(x-1)+2(x-1)^2等于多少?
人气:348 ℃ 时间:2020-02-02 21:01:51
解答
3(x+1)²-5(x+1)(x-1)+2(x-1)²
=[(x+1)-(x-1)][3(x+1)-2(x-1)]
=2(x+5)
=2x+10
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