试说明:多项式(5x³-7x³y+3x²y)+2x³-(-7x³y+3
试说明:多项式(5x³-7x³y+3x²y)+2x³-(-7x³y+3
说明理由:多项式(5x的立方-7x立方y+3x平方y)+2x立方-(-7x立方y+3x平方y+7x立方)的值与x.y的值
多项式因式分解 1,(x-y)³-(x-y)²(x+y) 2,x(x²-xy)-(4x
说明理由:多项式(5x³-7x³y+3x²y)+2x-(-7x³y+3x&sup
已知一个多项式加﹣2x³+4x²y+5y³得到X³-3X²Y+2Y
5(x-y)³-3(x-y)²+7(x-y)-5(x-y)³+(x-y)²-5(
试说明代数式-(3x²y+10x³)+3x³6x³y+3x的值与x,y都无关
合并同类项:-6x²y-x+5x²y-2x+x³y+3x
若x、y满足2x+y=6,x-3y=1,求7y(x-3y)²-2(3y-x)³的值
说明理由:多项式(5x的3次方-7x的3次方Y+3x平方y)+2x的3次方-(-7x的3次方y+3x平方y+7x的3次方
求因式分解(x-y)²-2(x-y)³和(x+y)(x-y)-x(x-y)
请把多项式:3x²y-3xy²+x³-5y³;