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b) 3 4 / 5 = (5 x 3 + 4) / 5 = 19 / 5
2.-
a) 3.5 = 35 / 10 = 7 / 2
b) 6.2 = 62 / 10 = 31 / 5
c) 0.25 = 25 / 100 = 5 / 20 = 1 / 4
d) 0.09 = 9 / 100
e) 0.3652 = 3652 / 1000 = 1826 / 500 = 913 / 250
3.- 5 4 / 6 + 2 3 / 4 = (6 x 5 + 4) / 6 + (4 x 2 + 3) / 4
34 / 6 + 11 / 4⇒ m.c.m. (6, 4)= 12 ⇒ (68 + 33) / 12 = 101 / 12
4.- 2 1 / 5 - 1 3 /10 = (5 x 2 + 1) / 5 - (10 x 1 + 3) / 10
11 / 5 - 13 /10⇒ m.c.m. (5, 10)= 10 ⇒ (22 - 13) / 10 = 9 / 10