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

Toán Lớp 6: 3 mũ x+1-3 mũ x=18. giúp em với ạ

Toán Lớp 6: 3 mũ x+1-3 mũ x=18. giúp em với ạ

Comments ( 2 )

  1. 3^(x+1)-3^x=18
    3^x. 3-3^x. 1=18
    3^x.(3-1)=18
    3^x. 2=18
    3^x=18:2
    3^x=9
    3^x=3^2
    =>x=2

  2. $3^{x+1}$ $-$ $3^{x}$ $=$ $18$
    $3^{x}$ $.$ $3$ $-$ $3^{x}$ $.$ $1$ $=$ $18$
    $3^x($$3$ $-$ $1)$ $=$ $18$
    $3^x$ $.$ $2$ $=$ $18$
    $3^x$ $=$ $18$ $:$ $2$
    $3^x$ $=$ $9$
    $3^x$ $=$ $3^2$
    $⇒$ $x$ $=$ $2$
    $Chúc$ $bạn$ $học$ $tốt!$

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

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