若1/x+1/y=2,则(2x-xy+2y)÷(3x+5xy+3y)
若1/x+1/y=2,则(2x-xy+2y)÷(3x+5xy+3y)
已知xy/x+y=1/2,则代数式3x-5xy+3y/-x+3xy-y=
若x+y=-1,则x^4+5x^3y+x^2y+8x^2y^2+xy^2+5xy^3+y^4=( )
若x-y=4,xy=1,求(-2xy+2x+3y)-(3xy+2y-2x)-(x+4y+xy)的值
若1/x-1/y=3,求5x+2xy-5y/x-4xy-y的值
若实数x,y满足1/x-1/y=5,则分式3x-2xy-3y/x+xy-y的值等于?
1、(-7x^y)(2x^y-3xy^3+xy) 2、((x-y)^6)/((y-x)^3)/(x-y)
[-(x-y)^2/xy]^-4*(y^2-xy/x)^3*(x^4/y^10)÷(xy-y^2/x)^-5=-y(y-
(x+2y-3xy)-(-2x-y+xy),其中x+y=1/2,xy=-1/2
若x+y分之xy=2,则-x+3xy-y分之3x-xy+3y=多少?
若x+y-5xy=0,求(2x-3xy+2y)/(x+2xy+y)的值
已知3/(x-y)=1/xy 求(-x-2xy+y)/ (2x+3xy-2y)