P=1/1.2 + 1/3.4+1/5.6+...+ 1/199.200 . Chứng minh 7/12 < P < 5/6

P=1/1.2 + 1/3.4+1/5.6+...+ 1/199.200 . Chứng minh 7/12 < P < 5/6
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