$@Mốc$
*Chú ý: $(a^{m})^{n}$ = $a^{m.n}$
$a^{m}.a^{n}$ = $a^{m+n}$
$C$ = $\frac{72^{3}.54^{2}}{108^{4}}$
$C$ = $\frac{(36.2)^{3}.(6.9)^{2}}{(36.3)^{4}}$
$C$ = $\frac{(6^{2}.2)^{3}.(6.3^{2})^{2}}{(6^{2}.3)^{4}}$
$C$ = $\frac{6^{6}.2^{3}.6^{2}.3^{4}}{6^{8}.3^{4}}$
$C$ = $\frac{6^{8}.2^{3}.3^{4}}{6^{8}.3^{4}}$
$C$ = $2^{3}$
$C$ = $8$
$#chucbanhoctotnhe;333$