已知Y-x=3xy,求(5x+3xy-5y)÷(x-2xy-y)
已知xy^2=-2,求-xy(x^2y^5-xy^3-y)的值.
已知xy^2=-2 求-xy(x^2y^5-xy^3-y)
已知x^2-xy=5,xy-y^2=-3求3(x^2-xy)-xy+y^2
已知X+Y分之XY=2,求-X+3XY-Y分之3X+5XY+3Y
已知xy/x+y=3,求代数式2x-5xy+2y/x-3xy+y
已知xy/x+y=2,求代数式3x-5xy+3y/-x+2xy-y的值
已知xy=2(x+y),求(5x-xy+5y)/(3xy-x-y)的值
已知x-y=2xy,求代数式3x-5xy-3y/x+xy-y的值
已知x分之一+y分之一=5,求2x-3xy+2y÷x+2xy+y
已知xy^2=-2求xy(2x^3y^7+5x^2y
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