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Sagot :

Bonjour

Calculer et donner le résultat sous la forme d'une fraction simplifiée :

a. 27/28 + 3/4

= 27/28 + (3 x 7) / (4 x 7)

= 27/28 + 21/28

= 48/28

= (4 x 12) / (4 x 7)

= 12/7

b. 25/14 - 30/42

= (25 x 3) / (14 x 3) - 30/42

= 75/42 - 30/42

= 45/42

= (3 x 15) / (3 x 14)

= 15/14

c. 25/36 - 2/3

= 25/36 - (2 x 12) / (3 x 12)

= 25/36 - 24/36

= 1/36

d. 39/40 - 4/5

= 39/40 - (4 x 8) / (5 x 8)

= 39/40 - 32/40

= 7/40.

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