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

Toán Lớp 6: C=2/3+14/15+34/35+-.+9998/9999

Toán Lớp 6: C=2/3+14/15+34/35+…..+9998/9999

Comments ( 2 )

  1. Giải đáp + Lời giải và giải thích chi tiết:
    Thu gọn: C = 2/3 + 14/15 + 34/35 + ….. + 9998/9999
    C = (1 – 1/3) + (1 – 1/15) + (1 – 1/35) + ….. + (1 – 1/9999)
    C = $\underbrace{(1 + 1 + 1 + ….. + 1)}_{Có  50  số  1}$ – (1/3 + 1/5 + 1/35 + ….. + 1/9999)
    C = 50 . 1 – (1/(1 . 3) + 1/(3 . 5) + 1/(5 . 7) + ….. + 1/(99 . 101))
    C = 50 – (1/1 – 1/3 + 1/3 – 1/5 + 1/5 – 1/7 + ….. + 1/99 – 1/101)
    C = 50 – (1 – 1/101)
    C = 50 – 1 + 1/101
    C = (50 – 1) + 1/101
    C = 49 + 1/101
    C = 4949/101 + 1/101
    C = (4949 + 1)/101
    C = 4950/101
    Vậy: C = 4950/101

  2. C = 2/3 + 14/15 + 34/35 + ….. + 9998/9999
    C = (1 – 1/3) + (1 – 1/15) + (1 – 1/35) + ….. + (1 – 1/9999)
    C = (1 + 1 + 1 + ….. + 1) – (1/3 + 1/5 + 1/35 + ….. + 1/9999) 
    C = 50 . 1 – (1/(1 . 3) + 1/(3 . 5) + 1/(5 . 7) + ….. + 1/(99 . 101))
    C = 50 – (1/1 – 1/3 + 1/3 – 1/5 + 1/5 – 1/7 + ….. + 1/99 – 1/101)
    C = 50 – (1 – 1/101)
    C = 50 – 1 + 1/101
    C = (50 – 1) + 1/101
    C = 49 + 1/101
    C = 4949/101 + 1/101
    C = 4950/101

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