化简2(-2x^2+3x+2)-3(7x^2-5x-1)-(4x^2-x+6)

问题描述:

化简2(-2x^2+3x+2)-3(7x^2-5x-1)-(4x^2-x+6)

-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