A=(1-1/2)(1-1/3)(1-1/4)….(1-1/2019)(1-1/2020) giúp mik lm nha

0 bình luận về “A=(1-1/2)(1-1/3)(1-1/4)….(1-1/2019)(1-1/2020) giúp mik lm nha”

1. $A= (1 – 1/2).(1-1/3).(1-1/4)….(1-1/2019).(1-1/2020)$

   $⇔ A = 1/2 . 2/3 . 3/4 ….2018/2019.2019/2020$

   $⇔ A = 1.2.3.4…..2018.2019/2.3.4…..2019.2020$

   $⇔ A = 1/2020$

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2. `A=(1-1/2)(1-1/3)(1-1/4)…(1-1/2019)(1-1/2020)`

    

   `⇒A=1/2 . 2/3 . 3/4…2018/2019 . 2019/2020`

    

   `⇒A={1.2.3…2018.2019}/{2.3.4…2019.2020}`

    

   `⇒A=1/2020`

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