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

Toán Lớp 7: s=`1/3`+`1/3^2`+`1/3^3`+`1/3^4`+…+`1/3^98`+`1/3^99`+`1/3^100`

Home/ Toán Lớp 7: s=`1/3`+`1/3^2`+`1/3^3`+`1/3^4`+…+`1/3^98`+`1/3^99`+`1/3^100`

Toán Lớp 7: s=`1/3`+`1/3^2`+`1/3^3`+`1/3^4`+…+`1/3^98`+`1/3^99`+`1/3^100`

Tháng Bảy 27, 2022 Toán học 1 Comment 0 views

Toán Lớp 7: s=1/3+1/3^2+1/3^3+1/3^4+…+1/3^98+1/3^99+1/3^100

Comments ( 1 )

  1. tuyen98
    tuyen98
    27 Tháng Bảy, 2022 at 6:46 chiều
    Reply
    Giải đáp:
     
    Lời giải và giải thích chi tiết:
    S = 1/3 + 1/3^2 + 1/3^3 +…….+ 1/3^99 + 1/3^100
    3S = 1 + 1/3 + 1/3^2 +……..+ 1/3^98 + 1/3^99
    => 3S – S = 2S = 1 – 1/3^100
    => S = 1/2 – 1/(3^100 . 2)
               Vậy S = 1/2 – 1/(3^100 . 2) 

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

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