cho A = 1/3^2 + 3/3^4 + 5/3^6 + .... + 99/3^100 . Chứng minh A < 5/32

cho A = 1/3^2 + 3/3^4 + 5/3^6 + .... + 99/3^100 . Chứng minh A < 5/32
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