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

Toán Lớp 5: Tìm G giúp : G = 1 + 1/3 + 1/9 + 1/27 + 1/81

Toán Lớp 5: Tìm G giúp :
G = 1 + 1/3 + 1/9 + 1/27 + 1/81

Comments ( 2 )

  1. text{Giải đáp + Lời giải và giải thích chi tiết :}
    G = 1 + 1/3 + 1/9 + 1/27 + 1/81 
    G xx 3 = ( 1 + 1/3 + 1/9 + 1/27 + 1/81 ) xx 3
    G xx 3 = 3 + 1 + 1/3 + 1/9 + 1/27
    G xx 3 – G = 3 + 1 + 1/3 + 1/9 + 1/27 – 1 – 1/3 – 1/9 – 1/27 – 1/81 
    G xx 2 = 3 – 1/81 
    G xx 2 = 242/81
    G = 242/81 : 2
    G = 121/81 .
    text{@muoiakiramobile}

  2. G = 1 + 1/3 + 1/9 + 1/27 + 1/81
    G xx 3 = 3 xx ( 1 + 1/3 + 1/9 + 1/27 + 1/81 )
    G xx 3 = 3 + 1 + 1/3 + 1/9 + 1/27
    G xx 3 – G = ( 3 + 1 + 1/3 + 1/9 + 1/27 ) – ( 1 + 1/3 + 1/9 + 1/27 + 1/81 )
    G xx 2 = 3 – 1/81
    G xx 2 = 242/81
    G = 242/81 div 2
    G = 121/81
    => Vậy G = 121/81

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