已知x>0,y>0.z>0求证(y/x+z/x)(x/y+z/y)(x/z+y/z)大于等于8
已知x,y,z 大于0,x+y+z=2,求证 xz/y(y+z)+zy/x(x+y)+yx/z(z+x)大于等于2/3
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
已知:(x+y-z)/z=(x-y+z)/y+(y+z-x)/x,且xyz≠0,求代数式[(x+y)(y+z)(x+z)
已知x小于0,y大于0,z小于0,且/x/小于/y/,/y/大于/z/化简/x+z/-/y+z/+/x+y/-/x-y+
求解2x≥x+y+z 4y≥x+y+Z 8z≥x+y+z x、y、z均大于0
已知x,y,z满足xyz=1,求证x^3/(x+y)+y^3/(y+z)+z^3/(z+x)大于等于3
已知x大于0,y小于0,z大于0,且|x|大于|y|,|y|小于|z|,化简|x+z|+|y+z|-|x+y|
已知x大于0,y小于0,z小于0,且|X|大于|y|,|z|大于|x| .化简|x+z|-|y-z|-|x+y|
请问一下y、z小于0,x大于0,求|x-y|+|y-z|+|x-z|+|y+z|,
(x+y-z)(x-y+z)=
已知正数x.y.z满足x+y+z=1,求证:(1):(1/x-1)(1/y-1)(1/z-1)大于等于8;(2):1/x
y+z÷x=Z+X÷y=X+Y÷z,X+Y+Z不等0求X+Y-Z÷X+Y+z值