$\text{2)}$
$4^{x}$ = $\text{64}$
$4^{x}$ = $\text{}$$4^{3}$
$\Rightarrow$ $\text{x = 3}$
$\text{3)}$
$\text{}$$7^{x - 1} = 49$
$\text{}$$7^{x - 1} = $ $7^{2}$
$\Rightarrow$ $\text{x - 1 = 2}$
$\text{x = 2 + 1 = 3}$
$\text{4)}$
$\text{$6^{x + 1}$ = 216}$
$\text{$6^{x + 1}$ = }$$6^{3}$
$\Rightarrow$ $\text{x + 1 = 3}$
$\text{x = 2}$
$\text{5)}$
$\text{$2^{x - 3}$ - 40 = 948}$
$\text{$2^{x - 3}$ = 984 + 40}$
$\text{$2^{x - 3}$ = 1024}$
$\text{$2^{x - 3}$ =$2^{10}$ }$
$\Rightarrow$ $\text{x - 3 = 10 => x= 13 }$
$\text{6) }$
$\text{$2^{x - 5}$ : 2 = 16 }$
$\text{$2^{x - 5}$ = 16 . 2 = 32}$
$\text{$2^{x - 5}$ = }$$2^{5}$
$\Rightarrow$ $\text{x - 5 = 5 }$
$\text{x = 5 + 5 = 10 }$
$\text{7) }$
$\text{81 : $3^{x}$ = 3 }$
$\text{ $3^{x}$ =81 : 3 }$
$\text{ $3^{x}$ =27 }$
$\text{ $3^{x}$ = }$$3^{3}$
$\Rightarrow$ $\text{ x = 3 }$
$\text{ 9) }$
$\text{$16^{x}$ : $2^{x}$ = 32 }$
$\text{$2^{4 + x}$ : $2^{x}$ = 32 }$
$\text{$2^{4 + x}$ : $2^{x}$ = $2^{5}$ }$
$\text{$2^{4 + x - x}$ = $2^{5}$ }$
$\Rightarrow$ $\text{$2^{4 }$ = $2^{5}$ }$
$\Longrightarrow$ $\text{Không có giá trị của x }$
