已知x,y均为正数,且x>y,求证:2x+1/(x2-2xy+y2)>=2y+3
已知x,y均为正数,且x>y,求证:2x+1/(x2-2xy+y2)>=2y+3
已知x>y,且xy=1,求证:(x2+y2/x-y)≥2根号2
已知x2-2xy=3y2且x,y为非零实数 求:(1)2x+y/x-2y (2)2x2-3y2+5xy/x2+xy+y2
已知x,y为正数,且x2+ y2/2=1,则x√1+y2的最大值?
1.已知正数x,y满足x2-y2=2xy,求(x-y)/(x+y)的值
正数xy满足x2-y2=2xy,求x+y分之x-y的值
已知x.y为实数且x2+y2+12≤xy+6y,则sqrt{x+2y-1}= 结果为3,请提供过程,
已知x、y为正数,且x2+y2/2=1,则x√(1+y2)的最大值为?,x=?
已知2x=3y,求xy/(x2+y2)-y2/(x2-y2)的值
已知x(x-1)-(x2-y)=-3,求x2+y2-2xy的值
已知x2-3xy+2y2=10,且x-y=3,求2x-y的值.
已知xy=3,x2+xy-2y2=2(x+2y),且x≠-2y,则x+y=______.