1/5+1/16+1/25+1/41+1/60+1/85+1/113<1/2 chưng minh rang

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1. @Bongtrangdo

   1/114 <1/113 mà 1/113<…<1/16<1/5

   1/114+1/114+…+1/114 < 1/5+1/16+…+1/113

   ————————————

        57 phân số 

   =>57/114<1/5+1/16+…+1/113

   =>1/2<1/5+1/16+…+1/113

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