已知x-y=5,xy=3,则1/x-1/y=
已知xy/x+y=1/2,则代数式3x-5xy+3y/-x+3xy-y=
已知1/x-1/y=-3,则5x+xy-5y/x-xy-y的值为
已知1/x=1/y+3,则(5x+xy-5y)/(x-xy-y)的值为( )
已知x+y=5,xy=3,x³+y³=(x+y)(x²-xy+y²),则1/x&
已知x/1-y/1=3,则5x+xy-5y/x+2y-y的值为
已知x+y=1,xy=1/5,则x^2y=xy^2
已知x+y=3,xy=1,则4x+3xy+4y=
已知x+y=-1,xy=-2,求代数式-5(x+y)+(x-y)+x(xy+y)的值
已知1/x=1/y=6,则3x-2xy+3y/3xy+x+y=?
已知1/x-1/y=3,求x-2xy-y/5x+3xy-5y的值
已知1/x+1/y=5,求(3x-5xy+3y)/(x+xy+y)的值?
已知1/x+1/y=5 求2x-3xy+2y/3x+2xy+3y