ƯCLN ( 180 ; 320 ; 780 )
180 = 22 . 32 . 5
320 = 26 . 5
780 = 22 . 3 . 5 . 13
=> ƯCLN ( 180 ; 320 ; 780 ) = 22. 5 = 20
ƯCLN ( 1020 ; 380 ; 960 )
1020 = 22 . 3 . 5 . 17
380 = 22 . 5 . 19
960 = 26 . 3 . 5
=> ƯCLN ( 1020 ; 380 ; 960 ) = 22 . 5 = 20
Ta có :
\(180=2^2.3^2.5\)
\(320=2^6.5\)
\(780=2^2.3.5.13\)
=> \(UCLN\left(180,320,780\right)=2^2.3.5=60\)
Ta có :
\(1020=2^2.3.5.17\)
\(380=2^2.5.19\)
\(960=2^6.3.5\)
=> \(UCLN\left(1020,380,960\right)=2^2.5=20\)