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

Toán Lớp 6: Tính 1/2.4+1/4.6+1/6.8+1/8.10 1/5.10+1/10.15+1/15.20+1/20.25

Home/ Toán Lớp 6: Tính 1/2.4+1/4.6+1/6.8+1/8.10 1/5.10+1/10.15+1/15.20+1/20.25

Toán Lớp 6: Tính 1/2.4+1/4.6+1/6.8+1/8.10 1/5.10+1/10.15+1/15.20+1/20.25

Tháng Hai 19, 2023 Toán học 2 Comments 0 views

Toán Lớp 6: Tính
1/2.4+1/4.6+1/6.8+1/8.10
1/5.10+1/10.15+1/15.20+1/20.25

Comments ( 2 )

  1. mytamhoang
    mytamhoang
    19 Tháng Hai, 2023 at 9:31 chiều
    Reply
    Đáp án:
     
    Giải thích các bước giải:
     

    toan-lop-6-tinh-1-2-4-1-4-6-1-6-8-1-8-10-1-5-10-1-10-15-1-15-20-1-20-25

  2. mocmien87
    mocmien87
    19 Tháng Hai, 2023 at 9:31 chiều
    Reply
    1) Đặt A = 1/(2.4) + 1/(4.6) + 1/(6.8) + 1/(8.10)
    => 2A = 2/(2.4) + 2/(4.6) + 2/(6.8) + 2/(8.10)
    => 2A = 1/2 – 1/4 + 1/4 – 1/6 + 1/6 – 1/8 + 1/8 – 1/10
    => 2A = 1/2 – 1/10
    => 2A = 2/5
    => A = 1/5
    2) Đặt B = 1/(5.10) + 1/(10.15) + 1/(15.20) + 1/(20.25)
    => 5B = 5/(5.10) + 5/(10.15) + 5/(15.20) + 5/(20.25)
    => 5B = 1/5 – 1/10 + 1/10 – 1/15 + 1/15 – 1/20 + 1/20 – 1/25
    => 5B = 1/5 – 1/25
    => 5B = 4/25
    => B = 4/125

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

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