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

Toán Lớp 6: 1/2.5+1/5.8+1/8.11+…+1/47.50

Home/ Toán Lớp 6: 1/2.5+1/5.8+1/8.11+…+1/47.50

Toán Lớp 6: 1/2.5+1/5.8+1/8.11+…+1/47.50

Tháng Hai 11, 2023 Toán học 2 Comments 0 views

Toán Lớp 6: 1/2.5+1/5.8+1/8.11+…+1/47.50

Comments ( 2 )

  1. hoaiphuong85
    hoaiphuong85
    11 Tháng Hai, 2023 at 8:33 sáng
    Reply
    1/2.5+1/5.8+1/8.11+…+1/47.50
    =1/3(3/2.5+3/5.8+3/8.11+…+3/47.50)
    =1/3(1/2-1/5+1/5-1/8+1/8-1/11+…+1/47-1/50)
    =1/3(1/2-1/50)
    =1/3(25/50-1/50)
    =1/3. 12/25
    =4/25
     

  2. cobebongdem
    cobebongdem
    11 Tháng Hai, 2023 at 8:32 sáng
    Reply
    1/(2.5) + 1/(5.8) + 1/(8.11) + … + 1/(47.50)
    = 1/3 . 3 . (1/(2.5) + 1/(5.8) + 1/(8.11) + … + 1/(47.50))
    = 1/3 . (3/(2.5) + 3/(5.8) + 3/(8.11) + … + 3/(47.50))
    = 1/3 . (1/2 – 1/5 + 1/5 – 1/8 + … + 1/47 – 1/50)
    = 1/3 . (1/2 – 1/50)
    = 1/3 . 24/50
    = 4/25
     

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

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