若x+y=3,xy=1,则-5x-5y+3xy的值为( )
已知1/x=1/y+3,则(5x+xy-5y)/(x-xy-y)的值为( )
xy=-1,x+y=2,则(xy-2y)+3x+5y的值为
已知1/x-1/y=-3,则5x+xy-5y/x-xy-y的值为
若x+y-5xy=0,求(2x-3xy+2y)/(x+2xy+y)的值
已知x/1-y/1=3,则5x+xy-5y/x+2y-y的值为
若1/x+1/y=5,求3x+4xy+3y/x+3xy+y的值
若1/x-1/y=3,求5x+2xy-5y/x-4xy-y的值
已知1/x减1/y=-3,则(2x+xy-2y)/x-xy-y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?
已知xy/x+y=2,则代数式3x-5y+8y/-x+3xy-y的值
已知xy=-1,x+y=2,则(xy-2y)+3x+5y的值为()
已知x^-xy=5,xy-y^=-3,求式子3(x^-xy)-xy+y^的值