x+y=1 解2x+3xy+y^2=5
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=( )
已知x+y=-1,xy=-2,求代数式-5(x+y)+(x-y)+x(xy+y)的值
5xy平方-2x平方y+[3xy平方-(4xy-2x平方y-2x平方y)],其中x=-2,y=-1求值
(x-2)(y+3)=xy (x-5)(y+2)=xy 解方程组
[-(x-y)^2/xy]^-4*(y^2-xy/x)^3*(x^4/y^10)÷(xy-y^2/x)^-5=-y(y-
已知1/x+1/y=5 求2x-3xy+2y/3x+2xy+3y
若1/x+1/y=2,则(2x-xy+2y)÷(3x+5xy+3y)
已知1/x+1/y=5,求x+2xy+y/2x-3xy+2y的值
已知1/x+1/y=5 求2x-3xy+2y/x+2xy+y
已知:1/X+1/Y=5,求 2x-3xy+2y/x+2xy+y的值,
已知1/x-1/y=3,求x-2xy-y/5x+3xy-5y的值