Merci de bien vouloir m'aider en maths

Bonjour

1)

a. 4/5 + 3/5 x 1/2 = 4/5 + 3/10 = (4 x 2) / (5 x 2) + 3/10 = 8/10 + 3/10 = 11/10

b. - 3/4 x (1/5 - 3/10)

= (- 3 x 5) / (4 x 5) x [(1 x 4) / (5 x 4) - (3 x 2) / (20 x 2)]

= - 15/20 x (4/20 - 6/20)

= - 15/20 x (- 2/20)

= 30/20

= (10 x 3) / (10 x 2)

= 3/2

c. 2/3 - 1/5 : 5/8

= 2/3 - 1/5 x 8/5

= 2/3 - 8/25

= (2 x 25) / (3 x 25) - (8 x 3) / (25 x 3)

= 50/72 - 24/75

= 26/75

2)

11/10 = (11 x 15) / (10 x 15) = 165/150

3/2 = (3 x 75) / (2 x 75) = 225/150

26/75 = (26 x 2) / (75 x 2) = 52/150

Donc c'est a avec :

3/2 > 11/10 > 26/75.