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

Toán Lớp 6: giúp mình với 3 mũ 2x-4-x mũ 0=8

Toán Lớp 6: giúp mình với 3 mũ 2x-4-x mũ 0=8

Comments ( 2 )

  1. 3^2 . x – x^0 = 8
    9 . x – 1 = 8
    9 . x = 8 + 1
    9 . x = 9 
    x = 9 ÷ 9 
    x = 1
    Vậy x = 1

  2. $3^{2x-4}$ – $x^{0}$ = 8
    $⇒$ $3^{2x-4}$ – 1 = 8
    $⇒$ $3^{2x-4}$ = 9 = $3^{2}$
    $⇒$ $2x-4$ = $2$
    $⇒$ $2x$ = $6$
    $⇒$ $x$ = $3$

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

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