根号下[x^2+(y+4)^2] + 根号下[x^2+(y-4)^2] = 12

(x+y)/(根号下x+根号下y)+2xy/(x根号下y+y根号下x)=______.(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*根号下y） 一些二次根式已知4X^2+Y^2-4X-6Y+10=0,求(2/3X根号下9X+Y^2根号下X/Y^3)-(X^2根号下1/X-5X根号下Y/X)的值.已知根号下5约等于2.236,求(根号下80-根号下9/5)-(根号下16/5+4/5根号下45)的值.(结果精确到0.01) (1-2根 一些二次根式已知4X^2+Y^2-4X-6Y+10=0,求(2/3X根号下9X+Y^2根号下X/Y^3)-(X^2根号下1/X-5X根号下Y/X)的值.已知根号下5约等于2.236,求(根号下80-根号下9/5)-(根号下16/5+4/5根号下45)的值.(结果精确到0.01)(1-2根 根号下[x^2+(y+4)^2] + 根号下[x^2+(y-4)^2] = 12 如果 根号下x-根号下y等于根号下3+根号下2 根号下xy等于根号下6-根号下2 则 x+y=? 若x,y为实数,且y=根号下1-4x+根号下4x-1+二分之1,求根号下y分之x+2+x分之y-根号下y分之x-2+x分之y 设x>0,y>0,求证:1/2(x +y)2 +1/4(x +y)≥根号下xy(根号下x+根号下y) y=根号下1-2x+根号下4x-2 +3 ,则根号下y+6+根号下x+3又 二分之一= y=根号下x-1+根号1-x+1/2,x+4y的平方根 若x,y为实数,且y=x+2分之根号下(x平方-4)+根号下(4-x)平方+1,求 根号下x+y 若x＞0,y＞0,且根号下x(根号下x+根号下y)=3根号下y（根号下x+5根号下y）,求（2x+2根号下若x＞0,y＞0,且根号下x(根号下x+根号下y)=3根号下y（根号下x+5根号下y）,求（2x+2根号下xy+3y）/（x-根号下xy+y 若x,y满足y《根号下x-2+根号下2-x +4,化简y-4的绝对值-根号下y2-10y+25 已知根号下x^2-4x+4 + 根号下y^2+6y+9=0,求y^x 已知x+y-2根号下x-4根号下y+5=0,求实数x,y的值 y=根号下-x^2+4x的值域 已知y=根号下x-2根号下2+根号下2根号2 数学题：已知x、y、z满足：根号下3x-2y-4+根号下2x-7y+3=根号下2x-4y-z·根号下x/2-x+2y,求z的值.