Question

Tiim uoc chung lon nhat roi tim tap hop cac uoc chung cua cac so sau

A, 12 , 18, 24

B, 2100 va  924

Answer 1

a) 12 = 2² . 3

    18 = 2 . 3²

    24 = 2³ . 3

ƯCLN(12,18,24) = 2 . 3 = 6

ƯC(12,18,24) = Ư(6) = {1;2;3;6}

b) 2100 = 2² . 3 . 5² . 7 

     924 = 2² . 3 . 7 . 11

ƯCLN(2100,924) = 2² . 3 . 7 = 84

ƯC(2100,924) = Ư(84) = {1;2;3;4;6;7;12;14;21;28;42;84}

Answer 2

TL:

a) 12 = 22 . 3

    18 = 2 . 32

    24 = 23 . 3

ƯCLN(12,18,24) = 2 . 3 = 6

ƯC(12,18,24) = Ư(6) = {1;2;3;6}

b) 2100 = 22 . 3 . 52 . 7 

     924 = 22 . 3 . 7 . 11

ƯCLN(2100,924) = 22 . 3 . 7 = 84

ƯC(2100,924) = Ư(84) = {1;2;3;4;6;7;12;14;21;28;42;84}

HT