大师作文网(-4xy的三次方 )(-2X二次方)
来源：学生作业帮助网 编辑：作业帮 时间：2024/11/11 23:56:52
原式=2xy(x²+2xy+y²)=2xy(x+y)²=2*2*4²=64
x^2=y+4,所以x^2-y=4y^2=x+4,所以y^2-x=4x^3-2xy+y^3=（x^3-xy）+（y^3-xy）=x（x^2-y）+y（y^-x）=4x+4yx^2=y+4,y^2=x+
(-2/3x³y+4x²y²-1/2xy³)/(-xy/4)=-2/3x³y/(-xy/4)+4x²y²/(-xy/4)-1/2x
原式=2xy(4x²-2x-1)再问：求过程再答：没有提取公因式
-4x的三次方+xy²=x(y²-4x²)=x(y+x)(y-x)
原式=(x^4+xy³)-(2y^4+2x³y)=x(x³+y³)-2y(x³+y³)=(x-2y)(x³+y³)=(x
xy的三次方-2x²y²+x的三次方y=xy(y²-2xy+x²)=xy(x-y)²
(2x^4)y³－x³y^4=(x³y³)(2x－y)=(xy)³(2x－y)=4³×(1/16)=4
4x³-xy²=x(4x²-y²）=x(2x-y)(2x+y)
x²y³-2x(4xy³)=x²y³-2x²y³=-x²y³
原式=（﹣4x²y）·(﹣x²y²)·2xy³=(﹣4)×(﹣1)×2×(x²y·x²y²·xy³)=8x的5次方·y的
(4x的三次方y+6x的二次方y的二次方-xy的三次方)÷2xy=xy(4x²+6xy-y²)÷2xy=2x²+3xy-0.5y²
=xy(4x²+4xy+y²)=xy(2x+y)²
4x的三次方y+4x²y²+xy的三次方=xy（4x²+4xy+y²）=xy（2x+y）²
原式等于(xy)^2(x+y)将x+y=2,xy=4代入,得原式等于16×2=32
原式=3x³-3x²y-4xy²-2x³+4xy²-y³-x³+3x²y-y³合并同类项=-2y³所
x³y-xy³=xy(x²-y²)=xy(x+y)(x-y)
xy(x+y)²-4x³y³=xy[(x+y)²-4x²y²]=xy(x+y+2xy)(x+y-2xy)
4x³-xy²=x(4x²-y²)=x[(2x)²-y²]=x(2x+y)(2x-y)
原式=(-4)*(-2)*(x*x²)y³=8x³y³