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

Toán Lớp 6: T=[1/2-1/3]x[1/2-1/5]x[1/2-2/7]-[1/2-1/99]

Tháng Hai 20, 2023 Toán học 2 Comments 0 views

Toán Lớp 6: T=[1/2-1/3]x[1/2-1/5]x[1/2-2/7]….[1/2-1/99]

Comments ( 2 )

  1. phuongthaongoc
    phuongthaongoc
    20 Tháng Hai, 2023 at 7:28 sáng
    Reply
    T = ( 1/2 – 1/3 ) × ( 1/2 – 1/5 ) × ( 1/2 – 2/7 ) ….. ( 1/2 – 1/99 )
    ⇒ T = 1/2 × ( 1 – 2/3 ) × 1/2 × ( 1 – 1/5 ) × 1/2 × ( 1 – 3/7 ) …. 1/2 × ( 1 – 2/99 )   ⇒T = ( 1/2 × 4/9 ) × ( 1 – 2/3 ) × ( 1 – 2/5 ) …. ( 1 – 2/99 )
    ⇒ T = 49/2 × 1/99
    ⇒ 49/198
     

  2. tuyen98
    tuyen98
    20 Tháng Hai, 2023 at 7:28 sáng
    Reply
    T=(1/2−1/3)(1/2−1/5)(1/2−1/7)…..(1/2−1/99)
    ⇒T=1/2·(1−2/3)1/2·(1−2/5)1/2·(1−2/7)…..1/2·(1−2/99)
    ⇒T=(1/2.49)·[(1−2/3)·(1−2/5)·(1-2/7)…(1−2/99)]
    ⇒T=(1/3)·(3/5)·(5/7)·….·(97/99)
    ⇒T=(49/2).(1/99)
    ⇒T=49/198
     

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

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