Respuesta:
3 + 1/5 = 3/1 + 1/5 = 15/5 + 1/5 = 16/5 m.c.m = 5
1 x 3/4 = 3/4
2 - 8/5 = 2/1 - 8/5 = 10/5 - 8/5 = 2/5 m.c.m = 5
1/4 x 1/9 = 1/36
2/10 x 5/9 = 10/90 = 1/9
8/3 + 5/2 = 16/6 + 15/6 = 31/6 m.c.m (3,2) = 6
4/10 : 5/5 = 20/50 = 2/5
8/10 : 7/7 = 56/70
10/2 - 5/6 = 30/6 - 5/6 = 25/6 m.c.m (2,6) = 6
2 + 1/3 x 4/5 = 2 + 4/15 = 30/15 + 4/15 = 34/15 m.c.m = 15
3/8 - 2 + 1/3 x 5/8 = 3/8 - 2 + 5/24 = 9/24 - 48/24 + 5/24 = 34/24 m.c.m (8,24) = 24
9 x 1/2 x 5/4 + 3/3 = 9/2 x 5/4 + 3/3 = 45/ 8 + 3/3 = 135/24 + 24/24 = 159/24 m.c.m (8,3) = 24