Bài 1 : $24\times{[119-(23-6)]}$
$=24\times{[119-17]}$
$=24\times{112}$
$=2688$
Bài 2 :
a) $2\times{(x+55)}=120$
$(x+55)=120:20$
$(x+5)=60$
$x=60-5$
$x=55$
b) $12\times{x}-33=3^2021:3^2020$
$12\times{x}-33=3$
$12\times{x}=3+33$
$12\times{x}=36$
$x=36:12$
$x=3$
c) $2^{x+7}=2^{2}\times{16}+192$
$2^{x+7}=64+192$
$2^{x+7}=256$
$2^{x+7}=2^8$
$\Leftrightarrow{x+7=8}$
$x=8-7$
$x=1$
d) $3^x -1=80$
$3^x=80+1$
$3^x=81$
$3^x=3^4$
$➡x=4$