X^2 -7xy-12y^2=0,y≠0.求X/Y的值

x^2-7xy+12y^2=0,求x^2-2xy+y^2/2xy的值 已知x²-7xy+12y²=0求x²-xy+y²/2xy的值 已知7x^2+5y^2=12xy.xy≠0,则x/y为 X×X-2XY-Y×Y+2X-2Y+2=02X×2X-4XY-2Y×2Y+3X-3Y+4=0X×X+2XY+Y×Y+X+Y-56=0X×X-2XY+Y×Y-X+Y-12=0X×X-3XY+Y×Y=-13X×3X-XY+3Y×3Y=13 两个在一起的方程之间有所联系（要求一步一步写出来） 已知x2-7xy+12y2=0(y≠0),求(x-y)/(x+2y)的值 X^2 -7xy-12y^2=0,y≠0.求X/Y的值 已知x^2-7xy+12y=0,且x.y不等于0,求x^2-2xy+y^2/2xy的值 已知x/2=y/3（xy≠0）,求x²-2xy-3y²/x²-6xy-7y²的值 |x-2|+|y-2|=0,求xy=?；|x|=-|y-7|,则xy=? 如果x+y=0,xy=-7,则x^2y+xy^2=? 已知x+y=0,xy=-7,求x^2y+xy^2 (x+y)^2/y^2-xy÷[-y^2+xy/(x-y)^2,x=0,y=根号10 已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值? 已知x-7y=0,且y≠0,求2x²﹢xy-3y²分之x²-3xy+y²的值 已知3x²+xy-2y²=0(x≠0,y≠0),求x/y-y/x-x²+y²/xy的值 当实数x,y满足xy+x+y+7=0,3x+3y=9+2xy,则x平方y+xy平方=多少 已知x^2-3xy+2y^2=0(xy≠0),则x/y+y/x= x^2+y^2=3xy xy≠0 求x^2 y^-2 + x^-2 y^2