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

Toán Lớp 5: 9.Tính nhanh : (1- 2/5 ) x ( 1- 2/7 ) x( 1- 2/9 ) x ( 1- 2/11 ) x … x ( 1- 2/97 ) X ( 1- 2/99 )

Tháng Sáu 20, 2022 Toán học 2 Comments 0 views

Toán Lớp 5: 9.Tính nhanh :
(1- 2/5 ) x ( 1- 2/7 ) x( 1- 2/9 ) x ( 1- 2/11 ) x … x ( 1- 2/97 ) X ( 1- 2/99 )

Comments ( 2 )

  1. aivilanlan
    aivilanlan
    20 Tháng Sáu, 2022 at 11:26 sáng
    Reply
    ( 1 – 2/5 ) x ( 1 – 2/7 ) x ( 1 – 2/9 ) x ( 1 – 2/11 ) x …… x ( 1 – 2/97 ) x ( 1 – 2/99 )
    = 3/5     x     5/7   x   7/9   x    9/11   x …… x    95/97   x     97/99
    = 3/99
     = 1/33

  2. maingoctruc
    maingoctruc
    20 Tháng Sáu, 2022 at 11:26 sáng
    Reply
    (1-2/5)xx(1-2/7)xx(1-2/9)xx(1-2/11)xx…xx(1-2/97)xx(1-2/99)
    =3/5xx5/7xx7/9xx9/11xx…xx95/97xx97/99
    =(3xx5xx7xx9xx…xx95xx97)/(5xx7xx9xx11xx…xx97xx99)
    =(3xx1xx1xx1xx…xx1xx1)/(1xx1xx1xx…xx1xx99)
    =3/99
    =1/33

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

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