Bonjour est ce que vous pouvez m’aider merci d’avance

Réponse :

Explications étape par étape

Bonjour

Calculer :

7/9 + 5/9

= (7 + 5)/9

= 12/9

= (3 x 4)/(3 x 3)

= 4/3

7/9 x 5/9

= (7 x 5)/(9 x 9)

= 35/81

1/4 + 7/12

= (1 x 3)/(4 x 3) + 7/12

= 3/12 + 7/12

= 10/12

= (2 x 5)/(2 x 6)

= 5/6

1/4 x 7/12

= (1 x 7)/(4 x 12)

= 7/48

9/7 + 2

= 9/7 + (2 x 7)/7

= 9/7 + 14/7

= 23/7

9/7 x 2

= (9 x 2)/7

= 18/7

2/5 + 5/7

= (2 x 7)/(5 x 7) + (5 x 5)/(7 x 5)

= 14/35 + 25/35

= 39/35

2/5 x 5/7

= 5/5 x 2/7

= 2/7