X/Y+Z=Y/X+Z+1=Z/X+Y-1=X+Y+Z,求x+y+z等于多少

(x+y-z)(x-y+z)= X+Y+Z=200,1/3X+4Y+5Z=200,求X,Y,Z等于多少? 已知x,y,z满足x/(y+z)+y/(z+x)+z/(x+y)=1,求代数式x2/(y+z)+y2/(x+z)+z2/ 已知实数x,y,z满足x/(y+z)+y/(z+x)+z/(x+y)=1,求x2/(y+z)+y2/(z+x)+z2/( x+y+z=1 求xyz/(x+y)(y+z)(z+x)的最大值 X+Y+Z=? x y z x+y--- = --- = ---- ----y+Z z+x x+y ,求 z 的值 .求 x+y---- x+y分之一=1,y+z分之一=1,求z+x分之一等于多少 已知x+y-z/z=x-y+z/y=-x+y+z/x,且xyz不等于0,求分式[(x+y)(x+z)(y+z)]/xyz 若z分之x+y+z=y分之x-y+z=x分之-x+y+z,求xyz分之(x+y)(y+z)(z+x) y+z÷x=Z+X÷y=X+Y÷z,X+Y+Z不等0求X+Y-Z÷X+Y+z值 (x+y-z)/z=(y+z-x)/x=(z+x-y)/y 求(x+y)(y+z)(z+x)/xyz