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

Toán Lớp 6: SO SÁNH : Cho H = 1 +2 + 2^2 + 2^3 …+2^2000 và cho K = 2^2001-1

Toán Lớp 6: SO SÁNH :
Cho H = 1 +2 + 2^2 + 2^3 …+2^2000 và cho K = 2^2001-1

Comments ( 2 )

  1. H=1+2+2^2+2^3+…+2^2000
    =>2H=2+2^2+2^3+2^4+…+2^2001
    =>H=2H-H=2^2001-1=K
    Vậy H=K
     

  2. H = 1 +2 + 2^2 + 2^3+ …+2^2000
    2H=2 + 2^2 + 2^3 +2^4+…+2^2001
    2H-H=(2 + 2^2 + 2^3 +2^4+…+2^2001)-(1 +2 + 2^2 + 2^3+ …+2^2000)
    H=2 + 2^2 + 2^3 +2^4+…+2^2001-1 -2 – 2^2 – 2^3- …-2^2000
    H= 2^2001-1
    K=2^2001-1
    H=2^2001-1
    =>K=H=2^2001-1
     

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