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Sagot :

Bonjour,

a)

2/7 = 8/28

1/4 = 7/28

7  14 21  28

4  8, 12, 16  20  24   28

2/7 * (2*4) / (4*7)

8/ 28 + 7/28 = 15/28

b)

16/30 - 15/30 = 1/30

c)

15/18 - 4/18 =  11/18

d)

27/12 - 2/12 = 25/12

e)

9  18   27   36

12  24  36

4/36 + 15/36 = 19/36

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