Cho $a_{1},a_{2},a_{3},...,a_{n}\geq 0$ sao cho $a_{1}+a_{2}+a_{3}+...+a_{n}=1$.
Chứng minh:
$(a_{1}^{2}+1)(a_{2}^{2}+1)...(a_{n}^{2}+1)\geq (\frac{n^{2}+1}{n^{2}})^{n}$
$(a_{1}^{2}+1)(a_{2}^{2}+1)...(a_{n}^{2}+1)\geq (\frac{n^{2}+1}{n^{2}})^{n}$
Started By NTMFlashNo1, 13-06-2017 - 10:23
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