2X=3Y=10,请问12XY=?
xy=-2,x+y=3,求代数式(4xy+12y)+[7x-(3xy+4y-x)]
[-(x-y)^2/xy]^-4*(y^2-xy/x)^3*(x^4/y^10)÷(xy-y^2/x)^-5=-y(y-
(-3x^y+2xy)-( )=4x^+xy
已知x-y=4xy,则2x+3xy-2yx-2xy-y
由已知x+y=-2,xy=3那么2(x+xy)-[(xy-3y)-x]-(-xy)等于多少?
已知2x+xy=10,3y+2xy=6.求4x+8xy+9y=?
已知x^2-xy=5,xy-y^2=-3求3(x^2-xy)-xy+y^2
已知x+y=12,xy=9,求(x+3xy+y)/(xy+xy)的值
(x+2y-3xy)-(-2x-y+xy),其中x+y=1/2,xy=-1/2
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=
若x+y分之xy=2,则-x+3xy-y分之3x-xy+3y=多少?