a,b,c属于R+,求证b/a+c/b+a/c>=3.
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a,b,c属于R+,求证b/a+c/b+a/c>=3.
a,b,c属于R+,求证b/a+c/b+a/c>=3.
a,b,c属于R+,求证b/a+c/b+a/c>=3.
证明:(a/b+b/c+c/a)>=3×三次根号下(a/b×b/c×c/a)=3