为什么3x^2+11xy+10y^2=(3x+5y)(x+2y)
[-(x-y)^2/xy]^-4*(y^2-xy/x)^3*(x^4/y^10)÷(xy-y^2/x)^-5=-y(y-
已知xy/(x+y)=2求(3x-5y+3y)/(-x+3xy-y)
已知xy/x+y=2,求代数式3x-5y+3y/-x+3xy-y
已知xy/x+y=2,则代数式3x-5y+8y/-x+3xy-y的值
[x(x^2y^2-xy)-y(x^2-x^3y)]/3x^2y
(x+y)(x-y)-(2xy+3y)平方
已知x,y>0 2x+y+3=xy 求5x+4y最小值
若x+y-5xy=0,求(2x-3xy+2y)/(x+2xy+y)的值
已知xy/x+y=3,求代数式2x-5xy+2y/x-3xy+y
已知xy/x+y=2,求代数式3x-5xy+3y/-x+2xy-y的值
(3x-2y)(4x-5y)-11(x+y)(x-y)+5xy,已知X=3又1/2,y=2又1/3
已知x+y分之xy=2,那么3x-5xy+3y分之3xy-x-y=