bonjour pouvez vous m'aider à mais exercices de maths svp c'est pour lundi​

Bonjour,

Exercice 1

1)

5 544 = 2³ x 3² x 7 x 11

68 796 = 2² x 3³ x 7² x 13

2)

5 544/68 796

= [(2 x 2 x 3 x 3 x 7) x 2] / [(2 x 2 x 3 x 3 x 7) x (3 x 7 x 13)]

= (252 x 2) / (252 x 273)

= 2/273.

Exercice 2

1)

9/4 - 5/6 = (9 x 3) / (4 x 3) - (5 x 2) / (6 x 2) = 27/12 - 10/12 = 17/12

2)

10/21 x 14/15 = 140/315 = (35 x 4) / (35 x 9) = 4/9

3)

13/4 - 5/3 x 21/10 + 5/2

= 13/4 - 105/30 + 5/2

= 13/4 - (15 x 7) / (15 x 2) + 5/2

= 13/4 - 7/2 + 5/2

= 13/4 - 2/2

= 13/4 - 4/4

= 9/4