化简 x(x-1)+2x(x+1)-3x(2x-5)x(x-1)+2x(x+1)-3x(2x-5)
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化简 x(x-1)+2x(x+1)-3x(2x-5)x(x-1)+2x(x+1)-3x(2x-5)
化简 x(x-1)+2x(x+1)-3x(2x-5)
x(x-1)+2x(x+1)-3x(2x-5)
化简 x(x-1)+2x(x+1)-3x(2x-5)x(x-1)+2x(x+1)-3x(2x-5)
原式等于x²-x+2x²+2x-6x²+15x
=(1+2-6)x²+(-1+2+15)x
=-3x²+16x
x^2-x+2x^2+2x-6x^2+15x
=-3x^2+16x
=16x-3x^2
回答完毕
x(x-1)+2x(x+1)-3x(2x-5)
=x^2-x+2x^2+2x-6x^2+15x
=-3x^2+16x
原式=x^2-x=2x^2+2x-6x^2+15x
=-3x^2+16x
化简:x(2x+1)-x(x-3)
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