⒈若X^2+Xy-2y^2=0则(X^2+3Xy+y^2)/X^2+y^2=?
若x+y-5xy=0,求(2x-3xy+2y)/(x+2xy+y)的值
若x+y分之xy=2,则-x+3xy-y分之3x-xy+3y=多少?
已知x-y=4xy,则2x+3xy-2yx-2xy-y
已知3x*+xy-2y*=0,求(x/y)-(y/x)-(x*+y*)/(xy)的值.*是平方
若(y-x)/xy=3,求分式(2x+3xy-2y)/(x-2xy-y)的值
若y-x/xy=3,求分式2x+3xy-2y/x-2xy-y
(-3x^y+2xy)-( )=4x^+xy
已知xy/x+y=1/2,则代数式3x-5xy+3y/-x+3xy-y=
(xy-x^2)乘以(xy)/(x-y)
已知y-x-2xy=0,求3x+xy-3y/y-xy-x的值
已知y-x-2xy=0,求(3x+xy-3y)\(y-xy-x)的值
若x-y=4,xy=1,求(-2xy+2x+3y)-(3xy+2y-2x)-(x+4y+xy)的值