Cho S = 3/10 + 3/11 + 3/12 + 3/13 + 3/14. Chứng minh 1

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Cho S=$\frac{3}{10}+\frac{3}{11}+\frac{3}{12}+\frac{3}{13}+\frac{3}{14}$. Chứng minh1<S<2