НОД ( 48,56 ) = 2 × 2 × 2 = 8.
48 | 2
24 | 2
12 | 2
6 | 2
3 | 3
1.
____
56 | 2
28 | 2
14 | 2
7 | 7
1.
48 = 2 × 2 × 2 × 2 × 3.
56 = 2 × 2 × 2 × 7.
________________
НОК ( 42,56 ) = 2 × 2 × 2 × 3 × 7 = 168.
42 | 2
21 | 3
7 | 7
1.
____
56 | 2
28 | 2
14 | 2
7 | 7
1.
42 = 2 × 3 × 7.
56 = 2 × 2 × 2 × 7.
Ответ: НОД ( 48,56 ) = 8; НОК ( 42,56 ) = 168.