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

Toán Lớp 7: 2^x + 2^x + 3 = 144 Cứu mik vs!!!

Toán Lớp 7: 2^x + 2^x + 3 = 144
Cứu mik vs!!!

Comments ( 2 )

  1. 2^x+ $2^{x+3}$ =144
    2^x + 2^x . 2^3 = 144
    2^x . (1+2^3) = 144
    2^x . 9 = 144
    2^x = 144 : 9
    2^x = 16
    2^x = 2^4
    ⇒x = 4

  2. 2^x + 2^(x + 3) = 144
    ⇒ 2^x + 2^x . 2³ = 144
    ⇒ 2^x(1 + 2³)        = 144
    ⇒ 2^x . 9               = 144
    ⇒ 2^x                    = 16
    ⇒ 2^x                    = 2^4 
    ⇒ x                           = 4

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