已知x+y=12,xy=9且0
已知x-y=3xy,且xy不等于0,则-3x+6xy+3y/(7x-5y)-9xy-(3x-y)
已知实数x、y满足xy>0,且8/xy+1/x+1/y=1,
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xy>0,且X平方y=2,求x平方+xy的最小值
已知x^2-xy+3y^2=0 且xy不等于0 求x/y+y/x 的值
已知x²-4xy+4y²=0,且xy≠0,那么x-y/x+y
已知xy≠0,且2x+3xy-2y=0,求(x+y)/(x-y)的值.
已知x,y是实数,且适合方程(xx+xy-12)(xx+xy-12)+(xy-2yy-1)(xy-2yy-1)=0求x,
已知x-y=4xy且xy≠0,求代数式-x-2xy+y分之2x+3xy-2y的值
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
已知x+y=2xy,且xy不等于0,则求-2x+6xy-2y/(7x+5y)-9xy-(3x+y)=___
已知x、y是实数,且适合方程(x²+xy-12)²+(xy-2y-1)² =0,求x、y的