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

Toán Lớp 5: ( 1 -1/2 ) x ( 1 -1/3 ) x( 1 -1/4 ) x … x ( 1 -1/99 ) x ( 1-1/100 )

Toán Lớp 5: ( 1 -1/2 ) x ( 1 -1/3 ) x( 1 -1/4 ) x … x ( 1 -1/99 ) x ( 1-1/100 )

Comments ( 2 )

  1. Answer
    (1 – 1/2) xx (1 – 1/3) xx (1 – 1/4) xx … xx (1 – 1/99) xx (1 – 1/100)
    = (2/2 – 1/2) xx (3/3 – 1/3) xx (4/4 – 1/4) xx … xx (99/99 – 1/99) xx (100/100 – 1/100)
    = 1/2 xx 2/3 xx 3/4 xx .. xx 98/99 xx 99/100
    = {1xx2xx3xx…xx99}/{2xx3xx4xx…xx100}
    = 1/100

  2. (1-1/2)xx(1-1/3)xx(1-1/4)xx…..xx(1-1/99)xx(1-1/100)
    (Chép lại đề bài )
    =1/2xx2/3xx3/4xx….xx98/99xx99/100
    ( tính trong ngoặc)
    =\frac{1xx2xx3xx…xx99}{2xx3xx4xx…xx100}
    ( Theo cách tính thông thường)
    =1/100
    ( giản ước mẫu số và tử số chung )

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

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