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Para encontrar el m.c.m. debes factorizar en números primos:
a) 45 I 3 90 I 2 m.c.m = 3×3×5×2 = 90
15 I 3 45 I 3
5 I 5 15 I 3
1 5 I 5
1
b) 12 I 2 34 I 2 m.c.m = 2×2×3×17 =204
6 I 2 17 I 17
3 I 3 1
1
c) 21 I 3 49 I 7 m.c.m = 7×7×3 = 147
7 I 7 7 I 7
1 1
d) 36 I 2 40 I 2 m.c.m = 2×2×2×3×3×5 =360
18 I 2 20 I 2
9 I 3 10 I 2
3 I 3 5 I 5
1 1
¡Ojalá te sirva!