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数学
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化简 2x-2[3x-2(-x的平方+2x-1)-4]
人气:105 ℃ 时间:2020-02-02 18:36:10
解答
原式=2x-2[3x+2(x^2-2x+1)-4]
=2x-2[3x+2(x-1)^2-4]
=2x-6x-4(x-1)^2+8
=-4[(x-1)^2+x-1-1]
=-4[(x-1)x-1]
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