Đáp án+Giải thích các bước giải:
`a) 12, 14, 20`
ƯCLN:
Có:
`@ 12 = 2^2 * 4`
`@ 14 = 2 * 7`
`@ 20 = 2^2 * 5`
`->` ƯCLN `(12, 14, 20) = 2`
`=>` ƯC `(12, 14, 20) = {1, 2}`
-----
BCNN:
Có:
`@ 12 = 2^2 * 4`
`@ 14 = 2 * 7`
`@ 20 = 2^2 * 5`
`->` BCNN `(12, 14, 20) = 2^2 * 4 * 5 * 7 = 420`
`=>` BC `(12, 14, 20) = {0, 420, 840,....}`
__________________________________________
`b) 34, 32, 20`
ƯCLN:
Có:
`@ 34 = 2 * 17`
`@ 32 = 2^5`
`@ 20 = 2^2 * 5`
`->` ƯCLN `(34, 32, 20) = 2`
`=> ƯC (34, 32, 20) = {1, 2}`
-----
BCNN:
Có:
`@ 34 = 2 * 17`
`@ 32 = 2^5`
`@ 20 = 2^2 * 5`
`->` BCNN `(34, 32, 20) = 2^5 * 5 * 17 = 2720`
`=>` BC `(34, 32, 20) = {0, 2720, 5440,....}`
