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计算:2(x+1)+x(x+2)-(x-1)(x+5)
人气:322 ℃ 时间:2020-02-06 06:11:51
解答
2(x+1)+x(x+2)-(x-1)(x+5)
=2x+2+x²+2x-(x²+5x-x-5)
=x²+4x+2-x²-4x+5
=7
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