已知x、y、z均为正实数,且xy+yz+xz=4xyz,则x/yz+y/xz+z/xy的最小值为多少?
人气：488 ℃ 时间：2019-12-13 15:52:18
解答
4
x/yz+y/xz+z/xy
=2(x平方+y平方+z平方）/2xyz
>=2(xy+yz+xz)/2xyz
>=4xyz/xyz
>=4
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