若x+y=3,xy=1,则(-5x+2)-(3xy+5y)等于多少
若x+y=3,xy=1,则(-5x+2)-(3xy+5y)等于多少
如果1\x-1\y=2,那么3x+5xy-3y\x-xy-y等于多少
若1/x+1/y=3,4y-2xy-4x/3x+xy-3x等于多少
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?
由已知x+y=-2,xy=3那么2(x+xy)-[(xy-3y)-x]-(-xy)等于多少?
已知xy/x+y=1/2,则代数式3x-5xy+3y/-x+3xy-y=
若x+y分之xy=2,则-x+3xy-y分之3x-xy+3y=多少?
x+y=-5,xy=3,则-x^3y-xy^3+2x^2y^2等于
1/x-1/y=3 求x-3xy-y/2x-xy-2y 等于多少
若1/x+1/y=2,则(2x-xy+2y)÷(3x+5xy+3y)
若x+y=-1,则x^4+5x^3y+x^2y+8x^2y^2+xy^2+5xy^3+y^4=( )
若x+y-5xy=0,求(2x-3xy+2y)/(x+2xy+y)的值