当x+y=5xy时,(3x+xy+3y)/x-2xy+y=?
当x=3,y=3分之1时,求代数出3xy-[2xy-2(xy-2分之3xy)+xy]+3xy的值
(-3x^y+2xy)-( )=4x^+xy
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,那么3x-5xy+3y分之3xy-x-y=
已知xy/x+y=1/2,则代数式3x-5xy+3y/-x+3xy-y=
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x-y=2xy,求代数式3x-5xy-3y/x+xy-y的值
若x+y-5xy=0,求(2x-3xy+2y)/(x+2xy+y)的值
已知xy=2(x+y),求(5x-xy+5y)/(3xy-x-y)的值
已知xy^2=-2,求-xy(x^2y^5-xy^3-y)的值.