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

Toán Lớp 6: ( 5x-2^4).7^3=7^5 Mọi người ơi! Giúp tui với nha ❤️

Toán Lớp 6: ( 5x-2^4).7^3=7^5
Mọi người ơi! Giúp tui với nha ❤️

Comments ( 2 )

  1. ( 5x-2^4).7^3=7^5
    ( 5x-2^4)=7^5:7^3
    ( 5x-2^4)=7^(5-3)
    ( 5x-2^4)=7^2
    5x-16=49
    5x=49+16
    5x=65
    x=65:5
    x=13
    Vậy x=13

  2. $\left(5x-2^4\right)\cdot \:7^3=7^5$
    $⇒\left(5x-2^4\right)\cdot \:7^3=16807$
    $⇒\dfrac{\left(5x-2^4\right)\cdot \:7^3}{343}=\dfrac{16807}{343}$
    $⇒5x-16=49$
    $⇒5x-16+16=49+16$
    $⇒5x=65$
    $⇒\dfrac{5x}{5}=\dfrac{65}{5}$
    $⇒x=13$
    Vậy $x=13$
     

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