根号(4-x^2)/|x-2|-2=y 这是那个分段涵数吗 我对这些特不会做 反而后面必修选修的还行!谢

已知实数x.y满足根号(x+y-8)+根号(8-x-y)=根号(3x-y-4)+根号(x-2y+7),求x,y 已知x=2y,化简根号y/(根号x-根号y)-根号y/(根号x+根号y) 已知x=2y,化简根号y/(根号x-根号y)-根号y/(根号x+根号y) 已知x=2y,化简:根号y/根号x -根号y -根号y/根号x +根号y 已知x =2y 化简（根号y/根号x -根号y )-(根号y/根号x +根号y) (根号x+根号y-1)(1-根号y+根号x),其中x=3根号2, 已知4x2+9y-4x-6y+2=0 求根号y/根号x+根号y - 根号y/根号x-根号y快. 已知4x2+9y-4x-6y+2=0 求根号y/根号x+根号y - 根号y/根号x-根号y急用. 求导数 y=(x*根号x根号x根号x)/3次根号x^2 4x-y/2根号x+根号y 9x-6根号xy+y/3根号x-根号y {（x-y)/(根号x+根号y)}-(x+y-2倍根号xy)/(根号x-根号y)=? 代数式求值.已知x=2,y=根号3,求 (根号x-根号y)/(根号x+根号y)+(根号x+根号y)/(根号x-根号y)已知x=2,y=根号3,求 (根号x-根号y)/(根号x+根号y)+(根号x+根号y)/(根号x-根号y) 已知y=根号(x-8)+根号(8-x)+18,求代数式[(x+y)/(根号x+根号y)]-2xy/(x根号y-y根号x)的值 根号x+2y×根号2x+4y (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x+x根号y/xy-y^2)-（x+根号xy+y/x根号x-y根号）y 已知y=根号1-x+根号x-1+3,求根号x+根号y分之x+2根号xy+y+根号x-根号y分之一的值 化简：y=根号 x+2根号x-1+根号 x-2根号x-1