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

Toán Lớp 6: x + (x+1) + (x+2) +…+ (x+2021) = 2067495

Toán Lớp 6: x + (x+1) + (x+2) +…+ (x+2021) = 2067495

Comments ( 2 )

  1. x+(x+1)+(x+2)+…(x+2021)=2067495
    x+x+1+x+2+..+x+2021=2067495
    (x+x+..+x)+(1+2+..+2021)=2067495
    Số hạng số trong tổng 1+2+..+2021là:
    (2021-1):1+1=2021 =2021(số)
    Tổng dãy đó là:
    (2021+1)xx2021:2=2043231
    Số hạng số x là:
    2021+1=2022
    Vậy 
    2022 x + 2043231=2067495
    2022x=24264
    x=24264:2022
    x=12
     

  2. x+(x+1)+(x+2)+…+(x+2021)=2067495
    x+x+1+x+2+…+x+2021=2067495
    2022x+(1+2+…+2021)=2067495
    2022x+2043231=2067495
    2022x=2067495-2043231
    2022x=24,264
    x=24264:2022
    x=12

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

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