a,\(42=2.3.7\)
\(58=2.29\)
\(\RightarrowƯCLN\left(42;58\right)=2\)
b, \(18=2.3^2\\ 30=2.3.5\\ 42=2.3.7\)
\(\RightarrowƯCLN\left(18,30,42\right)=2.3=6\)
a) 42 = 2.3.7
58 = 2.29
ƯCLN ( 42,58 ) = 2
b) 18 = 2.32
30 = 2.3.5
42 = 2.3.7
ƯCLN ( 18,30,42 ) = 2.3 = 6