Question

Calcule as subtrações com denominadores diferentes.

a) 9/2 - 5/4

MMC:

b) 2/3 - 1/9

MMC:

c) 3/4 - 1/2

MMC:

d) 5/7 - 1/3

MMC:

Answer 1

OI

a) 9/2 - 5/4

MMC = 2, 4 = 4

18 - 5 /4

13/4

b) 2/3 - 1/9

MMC = 3,9 = 9

6 - 1/9

5/9

c) 3/4 - 1/2

MMC = 4,2 = 4

3 - 2/4

1/4

d) 5/7 - 1/3

MMC = 7,3 =  21

15 - 7/21

8/21

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