若-x^2y=2,则-xy(x^5y^2-x^3y+2x)的值为多少?
已知x/1-y/1=3,则5x+xy-5y/x+2y-y的值为
xy=-1,x+y=2,则(xy-2y)+3x+5y的值为
已知xy/x+y=2,则代数式3x-5y+8y/-x+3xy-y的值
若1/x-1/y=3,则2x+3xy-2y/x-xy-y的值为多少
已知1/x-1/y=3,则代数式(2x-14xy-2y)/(x-2xy-y)的值为多少?
若x+y-5xy=0,求(2x-3xy+2y)/(x+2xy+y)的值
已知y-x=3xy,则代数式2x-14xy-2y分之x-2xy-y的值为多少?
若(x-4y)(x+3y)=0 且xy>0 则分式x+3y/2x-y的值为
若x/3y=y/(2x-5)=(6x-15y)/x,则(4x^2-5xy+6y^2)/(x^2-2xy+3y^2)的值为
已知1/x减1/y=-3,则(2x+xy-2y)/x-xy-y的值为
若x+y分之xy=2,则-x+3xy-y分之3x-xy+3y=多少?
已知1/x-1/y=2010,则分式(x+2xy-y)/(x-y)的值为多少?