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

Toán Lớp 6: 2 mũ x + 2 mũ x + 3 = Tìm thuộc n,biết

Toán Lớp 6: 2 mũ x + 2 mũ x + 3 =
Tìm thuộc n,biết

Comments ( 2 )

  1. 2^x +2^(x+3) =144
    => 2^x . 1 +2^x . 2^3 =144
    => 2^x . (1+8) =144
    => 2^x . 9 =144
    => 2^x =16
    => 2^x = 2^4
    => x =4
    Vậy x =4 . 

  2. 2^x + 2^(x + 3) = 144
    2^x + 2^x . 2^3 = 144
    2^x . 1 + 2^x . 8 = 144
    2^x . ( 1 + 8 ) = 144
    2^x . 9 = 144
    2^x = 144 : 9
    2^x = 16
    2^x = 2^4
    => x = 4
    Vậy x = 4
    #dtkc
     

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