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

Toán Lớp 5: tìm x 2 : x = 1/2 + 1/6 + 1/12 + 1/20 + … + 1/132

Toán Lớp 5: tìm x
2 : x = 1/2 + 1/6 + 1/12 + 1/20 + … + 1/132

Comments ( 2 )

  1. ~ Bạn tham khảo ~
    2 : x = 1/2 + 1/6 + 1/12 + 1/20 + …. + 1/132
    2 : x = 1/(1.2)+ 1/(2.3) + 1/(3.4)+1/(4.5) + …. + 1/(11.12)
    2 : x = 1 – 1/2 + 1/2 – 1/3 + 1/3 – 1/4 + 1/4 – 1/5 + ….. + 1/11 – 1/12
    2 : x = 1 – 1/12
    2 : x = 11/12
    x = 2 : 11/12
    x = 2 . 12/11
    x = 24/11
    Vậy x = 24/11

  2. 2 : x = 1/2 + 1/6 + 1/12 + 1/20 + … + 1/132
    2 : x = 1/{1 × 2} + 1/{2 × 3} + 1/{3 × 4} + 1/{4 × 5} + … + 1/{11 × 12}
    2 : x = 1/1 – 1/2 + 1/2 – 1/3 + 1/3 – 1/4 + 1/4 – 1/5 + … + 1/11 – 1/12
    2 : x = 1/1 – 1/12
    2 : x = 11/12
         x = 2 : 11/12
          x = 24/11
    #dtkc

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