化简:x^2-2xy+y^2-1 除以 x-y-1
化简(x的平方-4xy+4y的平方-1)除以(x-2y-1)
若(2x-14xy-2y)除以(x-2xy-y)=4,则1/x-1/y=
化简求值1.x^2+2xy+y^2/x^2-y^2除以x^2+xy/xy-y^2X=1Y=-2011
化简:(x-y)除以(根号x+根号y)-(x-2根号xy+y)除以(根号x-根号y)
化简,求值:(1/x+y)+(1/x-y)除以(2x/x^2-2xy+y^2)其中x=根号3,y=负根号2
(x+y-2xy)(x+y-2)+(1-xy)²
1.(2x/x平方-1)-(1/x-1) 2.(xy-x的平方)除以(x的平方-2xy+y的平方/xy)×(x-y /
(X+Y分之X+X+Y分之2Y)乘X+2Y分之XY除以(X分之1+Y分之1)要有过程
(x+y分之x + x+y分之2y)乘x+2y分之xy 除以(x分之1+y分之1)同样用两...
计算:(1)x^2-4y^2/x^2+2xy+y^2除以x+2y/x^2+xy(2)x+2y/x^2-y^2+y/y^2
1、(-7x^y)(2x^y-3xy^3+xy) 2、((x-y)^6)/((y-x)^3)/(x-y)
(1)(xy-x²)除以xy分之x²+y²-2xy 乘 x²分之x-y (2)先