1/x²+1/y²怎么化简成y²+x²/x²*y² 急用,说
1、y-x/x²-y²
因式分解:x²(x-y)+(y-x)
2.(x+y)²(x-y)²-(x-y)(x+y)(x²+y²)
已知x+y=1,xy=-二分之一,求x(x+y)(x-y)-x(x+y)²
已知x²+y²+5=2x+4y,求【2x²-(x-y)(x-y)】【(x+y-1)(x-y
[(y-2x)(-2x-y)-4(x-2y)²]*2y,其中x=1,y=2
【(1)/(x-y)+(1)/(x-y)】÷(2x)/(x²-2xy+y²)
计算3x[xy-2x(1/y-x/3]+3y(x²-y²)
计算:1、(xy分之x²-y²)×(x-y分之x)-(y分之x);
若|x+2y-1|+y²+4y+4=0,求(2x-y)²-2(2x-y)(x+2y)+(x+2y)&
(2x-y)²-4(x-y)(x+2y)
(x-y)³+9(x-y)-6(x-y)²