(2xy-x²)÷xy分之x-2y-搜答案-神马作文网

（2xy-x方)÷xy分之x-2y=x(x-2y)÷xy分之x-2y=x÷xy=1/y请采纳,谢谢再问：计算：(1)6x的立方y方÷（负x分之y)·y方分之x÷x方(2)4cdy分之3a方bx·21a

对.前提是x不等于y

=(2X/3Y)*(3X/4Y)*(4/xy)=(2x*3x*4)/(3y*4y*xy)=2x/(y^3)

=xy(x-y)×[-xy/(x-y)]=-(xy)²=-x²y²

3xy-[2xy-2(xy-2分之3xy)+xy]+3xy=6xy-[2xy-2xy+3xy+xy)=6xy-4xy=2xy=2×3×3分之1=2

xy/(x+y)=2∴xy=2(x+y)(3xy-x-y)/(3x-5xy+3y)=[6(x+y)-x-y]/[3x+3y-10(x+y)]=5(x+y)/[-7(x+y)]=-5/7

因为X+Y分之XY=2,所以XY=2(X+Y)代入后面的分子式得：13（X+Y)/5(X+Y)=13/5

x²+y²+2xy分之x²-4y²÷x²+xy分之2y+x=(x+2y)(x-2y)/(x+y)²×x(x+y)/(x+2y)=x(x-2y

原式(-xy/3)²*[xy(2x-y)-2x(xy-y²)]=(x²y²/9)(2x²y-xy²-2x²y+2xy²)

：（xy-x²）÷xy分之x²-2xy+y²乘x²分之x-y=-x(x-y)×xy/(x-y)²×(x-y)/x²=-y∴结果与x的值没有关

(3x^2+2xy)/xy-(2x^2-xy)/xy=(3x^2+2xy-2x^2+xy)/xy=(x^2+3xy)/xy=x(x+3y)/xy=(x+3y)/y

x-x^2分之x^2-1×1-y分之xy-x=(x+1)(x-1)/x(1-x)*[x(y-1)]/(1-y)=(x+1)/(-x)*(-x)=x+1（xy-x^2）÷xy分之x-y=x(y-x)*x

原式=(x+y)²/y(x-y)*(x-y)²/y(x+y)=(x+y)(x-y)/y²=(x²-y²)/y²

xy/(x+y)=2(x+y)/xy=1/21/x+1/y=1/2(3x-xy+3y)/(-x+3xy-y)=(3/y-1+3/x)/(-1/y+3-1/x)=[3(1/x+1/y)-1]/[(3-(

设x+y=axy=b,则b/a=3b=3a所以-X+3XY-Y分之2X-3XY+2Y可以写成(2a-3b)/(3b-a)=-7/8

（xy-x²）÷xy分之x²-2xy+y²乘x²分之x-y=-x(x-y)×xy/(x-y)²×(x-y)/x²=-y∴结果与x的值没有关系

(x-y)/x²÷(x²-2xy+y²)/xy×(xy-x²)=(x-y)/x²÷(x+y)²/xy×x(y-x)=(x-y)²/

（1）（2）(x-1分之x+2)+(x-1分之-3)=2乘以x-1得x+2-2=2x-2x-2x=-2x=2（3）(x+2分之1)+(x分之1)=x²+2x分之32乘以x(x+2)得x+x+