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

Toán Lớp 7: Tìm x: `3^{x+2}+4.3^{x+1}+3^{x-1}=6^6`

Toán Lớp 7: Tìm x: 3^{x+2}+4.3^{x+1}+3^{x-1}=6^6

Comments ( 2 )

  1. 3^(x + 2) + 4 . 3^(x + 1) + 3^(x – 1) = 6^6
    3^x . 3^2 + 4 . 3 . 3^x + 3^x : 3 = 6^6
    3^x . 9 + 12 . 3^x + 3^x . 1/3 = 6^6
    3^x . (9 + 12 + 1/3) = 6^6
    3^x . 64/3 = 6^6
    3^x = 6^6 : 64/3
    3^x = 46656 : 64/3
    3^x = 2187
    3^x = 3^7
    => x = 7
     

  2. Đáp án:
     
    Giải thích các bước giải:
     

    toan-lop-7-tim-3-2-4-3-1-3-1-6-6

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