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

Toán Lớp 6: (1-1/2)×(1-1/3)×(1-1/4)- (1-1/2020)×(1-1/2021)

Toán Lớp 6: (1-1/2)×(1-1/3)×(1-1/4)…. (1-1/2020)×(1-1/2021)

Comments ( 2 )

  1. Giải đáp:
     
    Lời giải và giải thích chi tiết:
     (1 – 1/2) . (1 – 1/3) . (1 – 1/4) . …. . (1 – 1/2020) . (1 – 1/2021)
    = 1/2 . 2/3 . 3/4 . … . 2019/2020 . 2020/2021
    = 1/2021

  2. (1 – 1/2) . (1 – 1/3) . (1 – 1/4) … (1 – 1/2020) . (1 – 1/2021)
    = 1/2 . 2/3 . 3/4 . … . 2019/2020 . 2020/2021
    = (1.2.3…2019.2020)/(2.3.4…2020.2021)
    = 1/2021

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