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

Toán Lớp 7: (1/3)^x + (1/3)^x+4=82 Giúp mình với ạ !!!! Mình cần gấp !!!

Toán Lớp 7: (1/3)^x + (1/3)^x+4=82
Giúp mình với ạ !!!!
Mình cần gấp !!!

Comments ( 2 )

  1. (1/3)^x+$(\dfrac{1}{3})^{x+4}$=82
    (1/3)^x+(1/3)^x . (1/3)^4=82
    (1/3)^x+(1/3)^x . 1/81=82
    (1/3)^x . (1+1/81)=82
    (1/3)^x . 82/81=82
    (1/3)^x=82:82/81
    (1/3)^x=81
    (1/3)^x=(1/3)^-4
    ⇒x=-4
     

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