若x>y,xy=1,求证:[(x^2+y^2)/(x-y)]大于等于2倍根号2
x>y>0,xy=1,求证:(x^2+y^2)/x-y)>=2倍根号2
正数,x,y满足x+y=1,求证x分之2+y分大于等于3+2倍根号2
{(x-y)/(根号x+根号y)}-(x+y-2倍根号xy)/(根号x-根号y)=?
实数X,Y满足X大于等于Y大于等于1和2X平方-xy-5x+y+4=o,则x+y的值
若根号X-1+绝对值Y-3=0化简2倍根号x*根号xy/根号2y等于什么
若根号x-1+y-3的绝对值=0,化简2倍根号x*根号xy/根号2y等于什么
x根号x+x根号y/xy-y^2)-(x+根号xy+y/x根号x-y根号)y
x,y,z属于R+,求证根号下(x^2+y^2-xy)+根号下(y^2+z^2-yz)大于根号下(x^2+y^2-xz)
已知正数 x,y 满足2x+y=1 (1)求证:1/xy大于等于8; (2)求1/x+1/y的最小值
已知根号x(根号x-根号y)=根号xy+3y,求(3x-y)分之2x+3倍根号xy-y 的值
已知x>y>0,xy=1,求证(x^2+y^2)/(x-y)≥2根号2
若x>0,y>0,且x-根号xy-2y=0,求y+2倍根号xy分之2x-根号xy的值