化简2（-2x^2+3x+2)-3(7x^2-5x-1)-(4x^2-x+6)
人气：376 ℃ 时间：2020-01-28 14:22:34
解答
-29x^2+22x+1过程呢？原式=-4x^2+6x+4-21x^2+15x+3-4x^2+x-6=(-4x^2-21x^2-4x^2)+(6x+15x+x)+4+3-6 =-29x^2+22x+1
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