xy=6,x-y=5,x^2y+xy^2
若x-y=5,xy=6,求x^2-xy^2和x^2y+xy^2
xy=6,x-y=5,x^2y+xy^2
若x+y=5,xy=6,求x^2y+xy^2的值
x*-2xy+3y*=9 4x*-5xy+6y*=30
x+y=8,xy=-2,求(5xy+4x+7y)+(6x-3xy)-(4xy-3y)的值
已知x^2-xy=5,xy-y^2=-3求3(x^2-xy)-xy+y^2
已知x>0,y>0,且x+6y=5根号xy,求(2x+根号xy-y)分之(x+根号xy+2y)的值
若x+y-5xy=0,求(2x-3xy+2y)/(x+2xy+y)的值
已知x+y分之xy=2,那么3x-5xy+3y分之3xy-x-y=
已知xy/x+y=1/2,则代数式3x-5xy+3y/-x+3xy-y=
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