Question

Answer 1

Bài 5:

a) Ta có:

\(12=2^2\cdot3\)

\(16=2^4\)

\(\Rightarrow BCNN\left(12,16\right)=2^4\cdot3=48\)

b) Ta có:
\(18=3^2\cdot2\)

\(24=2^3\cdot3\)

\(\Rightarrow BCNN\left(18;24\right)=2^3\cdot3^2=72\)

c) Ta có:

\(36=2^2\cdot3^2\)

\(54=2\cdot3^3\)

\(72=2^3\cdot3^2\)

\(\Rightarrow BCNN\left(36;54;72\right)=2^3\cdot3^3=216\)

d) Ta có:

\(60=2^2\cdot3\cdot5\)

\(90=2\cdot3^2\cdot5\)

\(120=2^3\cdot3\cdot5\)

\(\Rightarrow BCNN\left(60;90;120\right)=2^3\cdot3^2\cdot5=360\)