Đáp án:
Giải thích các bước giải:
b)|x-2|-3=$4^{2}$
|x-2| = 16+3
|x-2| = 19
=>\(\left[ \begin{array}{l}x-2=19\\x-2=-19\end{array} \right.\)
=>\(\left[ \begin{array}{l}x=21\\x=-17\end{array} \right.\)
c)$2^{3x+5}$ +5.$2^{x+1}$ . $2^{2x+3}$ + $2^{3x}$ =904
$2^{3x}$.$2^{5}$ +5.$2^{x}$.2 . $2^{2x}$.$2^{3}$+ $2^{3x}$ =904
$2^{3x}$($2^{5}$+1) +10.$2^{3}$.$2^{3x}$ =904
$2^{3x}$.33 + 80.$2^{3x}$ = 904
$2^{3x}$.113 = 904
$2^{3x}$ = 8 = $2^{3}$
=> 3x = 3 =>x=3
