(x^2+y^2)/(x^2-xy+y^2)=2,求x/y
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x根号x+x根号y/xy-y^2)-(x+根号xy+y/x根号x-y根号)y
(xy-x²)÷(x²-2xy+y²/xy)×(x-y/x²)
x-y/x²÷x²-2xy+y²/xy*(xy-x²)
(-x-y)(x^2+xy+y^2)
化简x^-y^/x^-2xy+y^
2*(x-y)²(y-x)(xy)
(x^2+xy/x-y)/(xy/x-y)计算
(x-y/x+y)^2÷(y-x/x^2+2xy+y^2)^2
X-Y/2X+2Y XY/X+Y²
因式分解:x×x-xy-2y×y-x-y
计算:3xy[2xy-x(y-2)+x]
因式分解:12xy^2(y-x)+xy^3(x-y)+4x^2y(x-y)
(x-y)[(x+y)^2-xy]+(x-y)[(x-y)^2+xy]
.(x+y-2)(x+y-2xy)+(xy-1)^2
(x^2-xy)y÷y-x/xy怎么做?
2(x+y)等于2xy/(x+y)为什么?
1.(xy-1)^2-(x+y-2xy)(2-x-y)2.(x+y)(x+y+2xy)+(xy-1)(xy+1)
【(x+y)²-(x-y)²】/2xy