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

Toán Lớp 6: tìm x : x + ( x + 1 ) + ( x + 2 ) + ( x + 3 ) + ( x + 4 ) + … + ( x + 60 ) = 2074

Home/ Toán Lớp 6: tìm x : x + ( x + 1 ) + ( x + 2 ) + ( x + 3 ) + ( x + 4 ) + … + ( x + 60 ) = 2074

Toán Lớp 6: tìm x : x + ( x + 1 ) + ( x + 2 ) + ( x + 3 ) + ( x + 4 ) + … + ( x + 60 ) = 2074

Tháng Bảy 28, 2022 Toán học 2 Comments 0 views

Toán Lớp 6: tìm x :
x + ( x + 1 ) + ( x + 2 ) + ( x + 3 ) + ( x + 4 ) + … + ( x + 60 ) = 2074

Comments ( 2 )

  1. daolanhoa
    daolanhoa
    28 Tháng Bảy, 2022 at 12:39 sáng
    Reply
    x + ( x + 1 ) + ( x + 2 ) + ( x + 3 ) + … + ( x + 60 ) = 2074
    => \underbrace{x + x + x + … + x}_{61  số  x} + \underbrace{1 + 2 + 3 + … + 60}_{60  số  hạng} = 2074
    => 61x + [(60 + 1 ) × 60 : 2] = 2074
    => 61x + [61 × 60 : 2] = 2074
    => 61x + [3660 : 2] = 2074
    => 61x + 1830 = 2074
    => 61x = 2074 – 1830
    => 61x = 244
    => x = 244 : 61
    => x = 4
    Vậy x = 4
    #dtkc
     

  2. thienthanh
    thienthanh
    28 Tháng Bảy, 2022 at 12:39 sáng
    Reply
    x + (x + 1) + (x + 2) + (x + 3) + (x + 4) + ….. + (x + 60) = 2074
    (x + x + x + ….. + x) + (1 + 2 + 3 + …… + 60) = 2074
    61x + [(60 – 1) : 1 + 1] = 2074
    61x + (61 . 60 : 2) = 2074
    61x + 1830 = 2074
    61x = 2074 – 1830
    61x = 244
    x = 244 : 61
    x = 4
    Vậy x = 4 

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

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