2(xy^2+3y^3-x^2y)-(-2x^2y+y^3+xy^2)-4y^3等于多少x=2,y=3
2(xy^2+3y^3-x^2y)-(-2x^2y+y^3+xy^2)-4y^3等于多少x=2,y=3
由已知x+y=-2,xy=3那么2(x+xy)-[(xy-3y)-x]-(-xy)等于多少?
1/x-1/y=3 求x-3xy-y/2x-xy-2y 等于多少
如果1\x-1\y=2,那么3x+5xy-3y\x-xy-y等于多少
(x+2y-3y)- (-2x-y+xy ) 其中x+y=0.5 xy等于-0.5
[-(x-y)^2/xy]^-4*(y^2-xy/x)^3*(x^4/y^10)÷(xy-y^2/x)^-5=-y(y-
若1/x+1/y=3,4y-2xy-4x/3x+xy-3x等于多少
(x+y)(x-y)-(2xy+3y)平方
已知3x^2+xy-2y^2=0,求{(x+y)/(x-y)+4xy/(y^2-x^2)}/{(x+3y)*(x-y)}
若x+y分之xy=2,则-x+3xy-y分之3x-xy+3y=多少?
已知x-y的绝对值等于4,xy=-3,xy^2+x^2y=?
已知xy=-2,x-y=3,求(x+y)(x-y)-y^2+(x-y)^2-(6x^2y-2xy^2)÷2y