$2^{x}$ + $2^{x+1}$ + $2^{x+2}$ + $2^{x+3}$ = 480
$\frac{1}{2}$ . $2^{x}$ + $2^{x+2}$ = $2^{8}$ + $2^{5}$
$\frac{1}{2}$ - $\frac{1}{3}$ . $6^{x}$ + $6^{x +2}$ = $6^{7}$ + $6^{4}$
Loga
Sinh Học lớp 12
