350 | 2
175 | 5
35 | 5
7 | 7
1
350 = 2 × 5^2 × 7
420 | 2 × 5
42 | 2
21 | 3
7 | 7
1 |
420 = 2^2 ×3 × 5 × 7
630 | 2 × 5
63 | 3
21 | 3
7 | 7
1 |
630 = 2 × 3^2 × 5 × 7
c.m.m.m.c (350;420;630) = 2^2 × 3^2 × 5^2 × 7 = 4 × 9 × 25 × 7 = 6 300
1/350 = 18/6300
1/420 = 15/6300
1/630 = 10/6300
