a) Ta có: \(42=21.2\)
\(30=2.3.5\)
\(20=2^2.5\)
\(\RightarrowƯCLN\left(42,30,20\right)=2\)
b) Ta có: \(4=2^2\)
\(14=2.7\)
\(26=2.13\)
\(\Rightarrow BCNN\left(4,14,26\right)=2^2.7.13=364\)
a: ƯCLN(42;30;20)=2
b: BCNN(4;14;26)=364
a) ƯCLN(42, 30, 20) = 2
b) BCNN(4, 14, 26) = 364
\(a,\)
\(42=2.3.7\)
\(30=2.3.5\)
\(20=2^2.5\)
\(\Rightarrow\)\(ƯCLN(42;30;20)=2\)
\(b,\)
\(4 = 2 ^2\)
\(14 = 2 ⋅ 7\)
\(26 = 2 ⋅ 13\)
\(\Rightarrow\)\(BCNN(4;14;26)=2 ^2 ⋅ 7 ⋅ 13 = 364\)
