a) $2^{x}$ = 16
$2^{x}$ = $2^{4}$
$x^{}$ = $4^{}$
- Vậy $x^{}$ = $4^{}$
b) $2^{x}$.$16^{}$ = $1024^{}$
$2^{x}$ = $1024^{}$ : $16^{}$
$2^{x}$ = $64^{}$
$2^{x}$ = $2^{6}$
$x^{}$ = $6^{}$
- Vậy $x^{}$ = $6^{}$
c) $64^{}$.$4^{x}$ = $16^{8}$
$4^{3}$.$4^{x}$ = $(4^{2})^{8}$
$4^{3}$.$4^{x}$ = $4^{16}$
$4^{x}$ = $4^{16}$ : $4^{3}$
$4^{x}$ = $4^{13}$
$x^{}$ = $13^{}$
- Vậy $x^{}$ = $13^{}$
d) $3^{x}$.$3^{}$ = $243^{}$
$3^{x}$ = $243^{}$ : $3^{}$
$3^{x}$ = $81^{}$
$3^{x}$ = $3^{4}$
$x^{}$ = $4^{}$
- Vậy $x^{}$ = $4^{}$
Chúc học tốt! ^v^
