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b)9/10: 27/30;45/50
c)2/4: 12/24;10/20
d)4/10: 8/20,16/40
e)3/9: 9/27;30/90
f)4/5: 24/30;28/35
g)1/8: 9/72;4/32
h)6/8: 12/16;24/32
i)2/6: 4/12,20/60
j)10/15: 100/150;40/60
1/6 . 3 = 3/6 = 1/2
9/10 . 2 = 18/ 20
9/10 . 3 = 27/ 10
2/4 . 4 = 8/4
2/4 .5 = 10/5
4/10 .4 = 16/ 10
4/10 . 5 = 20/ 10
3/9 . 6 = 18/ 9
3/9 .7 = 21/ 9
4/5 . 5 = 20/5
4/5 . 7 = 28/ 5
1/8 . 7 = 7/8
1/8 . 8 = 8/8 = 1
6/8 . 9 = 54/9
6/8 . 3 = 18/ 8
2/6 . 7 = 14/ 6
2/6 . 5 = 10/ 6
10/15 . 2 = 20/15
10/15 .3 = 30/ 15 = 2
Multiplicando por cualquier número obtengo fracciones equivalentes.