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

Toán Lớp 5: Tính tổng sau : 3/2.4+3/4.6+3/6.8+3/8.10+…+3/96.98+3/98.100

Home/ Toán Lớp 5: Tính tổng sau : 3/2.4+3/4.6+3/6.8+3/8.10+…+3/96.98+3/98.100

Toán Lớp 5: Tính tổng sau : 3/2.4+3/4.6+3/6.8+3/8.10+…+3/96.98+3/98.100

Tháng Sáu 2, 2022 Toán học 2 Comments 0 views

Toán Lớp 5: Tính tổng sau : 3/2.4+3/4.6+3/6.8+3/8.10+…+3/96.98+3/98.100

Comments ( 2 )

  1. dongoclandiem
    dongoclandiem
    2 Tháng Sáu, 2022 at 6:40 sáng
    Reply
    3/{2 . 4} + 3/{4 .6} + 3/{6 . 8} + … + 3/{98 . 100}
    = 3/2.(1/{2 . 4} + 1/{4 . 6} + 1/{6 . 8} + … + 1/{98 . 100} )
    = 3/2.(1/2 – 1/4 + 1/4 – 1/6 + 1/6 – 1/8 + … + 1/98 – 1/100 )
    = 3/2.( 1/2 – 1/100 )
    = 3/2. 49/100
    = 147/200
    #dtkc
     

  2. hatuanlan
    hatuanlan
    2 Tháng Sáu, 2022 at 6:40 sáng
    Reply
    Giải đáp:D = 3/2.4 + 3/4.6 + 3/6.8 + … + 3/98.100
    2/3.D=2/2.4+2/4.6+2/6.8+…+2/98.100
    2/3.D=1/2-1/4+1/4-1/6+1/6-1/8+…+1/98-1/100
    2/3.D=1/2-1/100
    2/3.D=49/100
    =>D=147/200
     
     

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

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