2 mũ 2x+1=27

$2^{2x+1}=27$

$2^{2x}.2=27$

$4^{x}=13,5$

→ $x$≈$1,878$

$*~Có~lẽ~đề~sai~nên~số~ra~ko~đẹp, ~nếu~3^{2x+1}=27~thì~sẽ~ra~số~tròn$