若-x^2y=2则-xy(x^5y^2-x^3y+2x)的值为
已知x/1-y/1=3,则5x+xy-5y/x+2y-y的值为
已知xy/x+y=2,则代数式3x-5y+8y/-x+3xy-y的值
若x+y-5xy=0,求(2x-3xy+2y)/(x+2xy+y)的值
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
xy=-1,x+y=2,则(xy-2y)+3x+5y的值为
若实数x,y满足1/x-1/y=5,则分式3x-2xy-3y/x+xy-y的值等于?
若x,y满足等式|x+2|+(y-3)^2=0,则(5x^2 y+5xy-7x)-(4x^2y+5xy-7x)的值为?
已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值?
若1/x-1/y=3,求5x+2xy-5y/x-4xy-y的值
若(x-4y)(x+3y)=0 且xy>0 则分式x+3y/2x-y的值为
已知x+y=-1,xy=-2,求代数式-5(x+y)+(x-y)+x(xy+y)的值