若x-xy-6y=0则x:y=
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若x>0,y>0,且x-根号xy=6y,则x/y=
若|x|/y+y/|y|=0,则|xy|/xy=?是:若|x|/x+y/|y|=0,则|xy|/xy=?
已知x-y=3xy,且xy不等于0,则-3x+6xy+3y/(7x-5y)-9xy-(3x-y)
|x|/x+y/|y|+xy/|xy|=
若2x^2-6xy+9y^2-4x+4=0,则y/x-x/y=若2x^2-6xy+9y^2-4x+4=0,则y/x-x/y=?
若实数x,y满足x^2-xy-y^2 =0,则x/y=?
若x+y=6,xy=2.75,x-y>0,求x-y的值
若x.y>0,9x+y=xy,则x+y的最小值为?
若x.y>0,9x+y=xy,则x+y的最小值为?
若|x-3|+(y+2)=0,则(x-y+4xy/x-y)(x+y-4xy/x+y)的值是
若|x-3|+(y+2)²=0,则(x-y+4xy/x-y)(x+y-4xy/x+y)的值是
若x+y=1,x不等于0则x+(2xy+y^2)/x/(x+y)/x=
若x+y=0,xy=-3则x^3y+xy^3=?
若y-2x=0,则分式(x^2+xy+y^2)/(x^2-xy+2y^2)=
若x²+xy-2y²=0,则x²+3xy+y²/x²+y²
若实数xy满足x^2+y^2-2x+6y=0 则x-2y的最大值
若(x*x+y*y)(x*x+y*y)-4x*x*y*y=0,求代数式(x*x+5xy+y*y)/(x*x+2xy+y*y)的值
若方程 ;x²-5xy+6y²=0,则x/y=