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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 6: `S =1/{1.2}+1/{2.3}+1/{3.4}+…+1/{2020. “

Toán Lớp 6: S =1/{1.2}+1/{2.3}+1/{3.4}+…+1/{2020. ”

Comments ( 2 )

  1. Giải đáp:
     
    Lời giải và giải thích chi tiết:
    S = 1/1.2 + 1/2.3 + 1/3.4 +……..+ 1/2020.2021
    S = 1 – 1/2 + 1/2 – 1/3 + 1/3 – 1/4 +………+ 1/2020 – 1/2021
    S = 1 – 1/2021
    S = 2020/2021 

  2. S = 1/{1.2} + 1/{2.3} + … + 1/{2020 . 2021}
    S = 1 – 1/2 + 1/2 – 1/3 + … + 1/2020 – 1/2021
    S = 1 + (-1/2 + 1/2) + (-1/3 + 1/3) + … + (-1/2020 + 1/2020) – 1/2021
    S = 1 – 1/2021
    S = 2021/2021 – 1/2021
    S = {2021-1}/2021
    S = 2020/2021
    $\text{Vậy}$ S = 2020/2021

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222-9+11+12:2*14+14 = ? ( )

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