1.(1)(x^2y-xy^2)÷(x-y)=_________.
1.(1)(x^2y-xy^2)÷(x-y)=_________.
1.已知x^2-4y^2=0,则分式(x^2-xy+y^2)/(x^2+xy+y^2)的值为_________.
已知2log3[(x—y) / 2]=log3(xy),则x / y=_________.
若x+y=3,xy=2,则(5x+2)-(3xy-5y)=_________
先化简,再求值(x-y/x+y)^2÷(y-x/x^2+2xy+y^2)^2*1/x+y,其中x=-4,y=1
化简求值1.x^2+2xy+y^2/x^2-y^2除以x^2+xy/xy-y^2X=1Y=-2011
先化简再求值:xy^3÷(-xy)+(x+2y)(x-2y),其中x=根号2,y=1
若1/x+1/y=2,则(2x-xy+2y)÷(3x+5xy+3y)
(x^2-xy)y÷y-x/xy怎么做?
(x+y-2xy)(x+y-2)+(1-xy)²
已知xy=-2,x-y=3,求(x+y)(x-y)-y^2+(x-y)^2-(6x^2y-2xy^2)÷2y
已知x+y=-1,xy=-2,求代数式-5(x+y)+(x-y)+x(xy+y)的值