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设xi>0,i=1,2,…,n.则有 这个不等式的证明,一般都要用到数学归纳法,而且还较为复杂。下面我们给出的一个证明是
Let xi>0,i=1,2,...,n. Then we have the proof of this inequality. Generally, we must use mathematical induction, and it is more complicated. One proof we give below is