以知:x^3-3y^2=2xy,求x+2y/x-y=?
已知xy=-2,x-y=3,求(x+y)(x-y)-y^2+(x-y)^2-(6x^2y-2xy^2)÷2y
已知3x^2+xy-2y^2=0,求{(x+y)/(x-y)+4xy/(y^2-x^2)}/{(x+3y)*(x-y)}
已知3x*+xy-2y*=0,求(x/y)-(y/x)-(x*+y*)/(xy)的值.*是平方
以知x+y分之xy=2,求代数式-x+2xy-y分之3x-5xy+3y的值
已知x-3y=0,求(2x+y)/(x^2-2xy+y^2)X(x-y)
已知xy=-2,x-y=3,求(x+y)(x-y)-y²+(x-y)²-(6x²y-2xy
已知x=3y,试求(x-y)^2+2xy-y^2/x^2+7xy+y^2
1/x-1/y=3,求2x+3xy-2y/x-y
若2x平方+3xy-2y平方=0,求x+y/x-y
|x+2y+3|+(2x+y)²=0求x²-xy+y²
已知xy/(x+y)=2求(3x-5y+3y)/(-x+3xy-y)
已知xy/x+y=2,求代数式3x-5y+3y/-x+3xy-y