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.
