tính nhanh : 1×1/15 x1x1/16 x1x1/17 x …x1x1/2016 x1x1/2017

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1. A = 1 1 15 .1 1 16 .1 1 17 . . . . . .1 1 2016 .1 1 2017 A=1115.1116.1117……112016.112017 A = 16 15 . 17 16 . 18 17 . . . . . . 2017 2016 . 2018 2017 A=1615.1716.1817……20172016.20182017 A = 16.17.18……2017.2018 15.16.17……2016.2017 A=16.17.18……2017.201815.16.17……2016.2017

   A = 2018/15

   Vậy A=2018/15 

    

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