Đáp án:
$\begin{array}{l}
BCNN\left( {8;\,\,9;1\,\,1} \right) = 792\\
BCNN\left( {24;\,\,40;\,\,168} \right) = 840.
\end{array}$
Giải thích các bước giải:
Ta có:
\(\begin{array}{l}8 = {2^3};\,\,\,\,9 = {3^2};\,\,\,11 = 1.11\\ \Rightarrow BCNN\left( {8;\,\,9;\,\,11} \right) = {2^3}{.3^2}.11 = 792.\end{array}\)
\(\begin{array}{l}24 = {2^3}.3;\,\,\,40 = {2^3}.5;\,\,\,168 = {2^3}.3.7\\ \Rightarrow BCNN\left( {24;\,\,40;\,\,168} \right) = {2^3}.3.5.7 = 840.\end{array}\)
