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

Toán Lớp 7: A = 4 . l-1/3 + 1/3^2 + -1/3^3 + … + 1/3^100 l + 1/3^100

Toán Lớp 7: A = 4 . l-1/3 + 1/3^2 + -1/3^3 + … + 1/3^100 l + 1/3^100

Comments ( 1 )

  1. Giải đáp:
    A=1
    Lời giải và giải thích chi tiết:
    A=4*|\underbrace{-1/3+1/3^2+(-1/3^3)+….+1/3^100}_{B}|+1/3^100
    A=|4.\underbrace{-1/3+1/3^2+(-1/3^3)+….+1/3^100}_{B}|+1/3^100
    3B=-1+1/3-1/3^2+….+1/3^99
    =>3B+B=-1+1/3^100
    =>4B==-1+1/3^100
    =>A=|-1+1/3^100|+1/3^100
    A=1-1/3^100+1/3^100(do 1>1/3^100)
    A=1

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

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