已知7x^2+5y^2=12xy.xy≠0,则x/y为
已知x^2-3xy+3=0,y^2+xy-7=0,则x-y的值为
已知y=3xy+x,求代数式2x+5xy-2y/x-2xy-y的值(xy≠0)
已知x²-7xy+12y²=0求x²-xy+y²/2xy的值
已知xy/x+y=1/2,则代数式3x-5xy+3y/-x+3xy-y=
已知x-y=3xy,且xy不等于0,则-3x+6xy+3y/(7x-5y)-9xy-(3x-y)
已知x-y=4xy,则2x+3xy-2yx-2xy-y
已知x+y=2xy,且xy不等于0,则求-2x+6xy-2y/(7x+5y)-9xy-(3x+y)=___
已知1/x减1/y=-3,则(2x+xy-2y)/x-xy-y的值为
已知x+y=5,xy=2则x^2y+xy^2=( )
已知xy^2=-2求xy(2x^3y^7+5x^2y
已知x+y=1,xy=1/5,则x^2y=xy^2
已知x+y=5,xy=-3,则x^2y+xy^2,