比较大小,说明理由:①(x+y)/2 ②根号下xy ③2xy/(x+y)
比较大小,说明理由:①(x+y)/2 ②根号下xy ③2xy/(x+y)
(x+y)/(根号下x+根号下y)+2xy/(x根号下y+y根号下x)=______.
(x*根号下x + x*根号下y ) / (xy-y^2) — (x + 根号下xy + y) /(x*根号下x — y
已知x>0,y>0试比较x+y与2倍根号下xy的大小,在什么情况下相等?
x根号x+x根号y/xy-y^2)-(x+根号xy+y/x根号x-y根号)y
①{(x+y)/(根号x+根号y)}+{2xy/根号xy(根号x+根号y)}
根号下(x^2-2xy+y^2/xy)化简 x>y>0
根号下(x^2-2xy+y^2/xy)化简 (x>y>0)
已知正实数x y满足x-根号xy-2y=0求 x+3根号xy+2y/2x-2根号下xy-y
若X>0,y>0,且x-根号下xy-2y=0,求(2x-根号下xy)/y+2根号下xy的值
若x>0,y>0,且x-根号下xy-2y=0,求【2x-根号下xy】÷【y+2根号下xy】的值
怎样比较:2xy/(x+y)与1/2*根号(1/x+1/y)的大小