Réponses

2014-03-02T15:06:45+01:00
Exercice n°1

A = 7/8 - 3/4 x 20/9
A = 7/8 - 3 x 4 x 5/4x 3 x 3
A = 7/8 - 5/3
A = 21/24- 40/24
A = -19/24

B= (5/3 - 1/9) : (1/2 + 2/3)
B = (15/9 - 1/9) : (3/6 + 4/6)
B = 14/9 : 7/6
B = 14/9 x 6/7
B = 7 x 2 x 3 x 2/3 x3 x 7 x 1
B = 4/3

C = 18/25 : (-27/15)
C = 18/25 x 15/-27
C = 3 x 6 x 3 x 5/5 x 5 x 3 x (-9)
C = 18/-45
C = 9 x 2/9 x (-5)
C = (-2/5)

D = Celui-là, je suis désolée mais je n'y arrive pas


A = (4 + 5*2 x 3) - 2 + 3 x 5 A= (4 + 25 x 3) - 2 + 15 A=4 +
A = 4 + 75 - 2 + 15 A = 92
B = 4 - 3*2 x (-2) + (-2)*3 x 3 B = 4 - 9 x (-2) - 8 x 3 B = 4 + 18 - 24 B= (-2)
Meeerci :D
Je t'en prie ^^