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

Toán Lớp 6: Tính tổng : M=1+3+3 ^{ 2 } +3 ^{ 3 } …+3 ^{ 1000 }

Toán Lớp 6: Tính tổng :
M=1+3+3 ^{ 2 } +3 ^{ 3 } …+3 ^{ 1000 }

Comments ( 2 )

  1. Lời giải chi tiết:
    M=1+3+3^2+3^3+…+3^1000
    3M=3+3^3+3^4+…+3^1001
    3M-M=(3+3^3+3^4+…+3^1001)-(1+3+3^2+3^3+…+3^1000)
    2M=3^1001-1
    M=(3^1001-1)/2

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