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

Toán Lớp 5: 1/5 + 1/45 + 1/117 +–…+1/49 x 53

Home/ Toán Lớp 5: 1/5 + 1/45 + 1/117 +–…+1/49 x 53

Toán Lớp 5: 1/5 + 1/45 + 1/117 +–…+1/49 x 53

Tháng Tư 4, 2023 Toán học 1 Comment 0 views

Toán Lớp 5: 1/5 + 1/45 + 1/117 +………..+1/49 x 53

Comments ( 1 )

  1. minhhaanh
    minhhaanh
    4 Tháng Tư, 2023 at 11:29 sáng
    Reply
    1/5+1/45+1/117+. . .+\frac{1}{49×53}
    = 1/(1xx5) + 1/(5xx9) + 1/(9xx13) +…+ \frac{1}{49×53}
    = 1/4( 4/(1xx5) + 4/(5xx9) + 4/(9xx13) +…+ \frac{1}{49×53})
    =1/4(1-1/5+1/5-1/9+1/9-1/13+. . .+1/49-1/53)
    =1/4(1-1/53)
    =1/4xx 52/53 =13/53
     

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

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