Merci de m'aider pour ce devoir en me notant le développement afin que je comprenne

A= 5/4 + 11/4 * 20/33

B= 1/12 : (2 - 7/3)

C= (1 + 2/3) (12/5 - 2 )

D= 15/14 - 6/7 * 2/3

E= 3/4 + 1/2 * (2/3 - 1)

F= 1/2 - 3/4 : 5/2

G= 4/3 - 2/5
________
5/2 + 3/10

1

Réponses

2013-09-12T22:02:13+02:00
Bonsoir
A= 5/4 + 11/4 * 20/33  Tu commences par la multiplication en la simplifiant
A = 5/4 + 1/1 x 5/3 = 5/4 +5/3 = 15/12 + 20/12 = 35/12

B= 1/12 : (2 - 7/3) = 1/12 : (6/3 -7/3) = 1/12 : -1/3 = 1/12 x -3 = -3/12 = -1/4


C= (1 + 2/3) (12/5 - 2 ) = (3/3 +2/3)(12/5 - 10/5) = 5/3 x 2/5 = 10/15 = 2/3

D= 15/14 - 6/7 * 2/3 = 15/14 - (2/7 x 2) = 15/14 - 4/7 = 15/14 - 8/14 = 1/14

E= 3/4 + 1/2 * (2/3 - 1) = 3/4 + 1/2x ( 2/3 - 3/3) = 3/4 x -1/3 = -3/12 = -1/4

F= 1/2 - 3/4 : 5/2 = 1/2 - 3/4 x 2/5 = 1/2 - 6/20 = 10/20 - 6/20 = 4/20 = 1/5

G= 4/3 - 2/5 = 20/15 -6/15 = 14/15
     ________
     5/2 + 3/10
= 10/10 +3/10 = 13/10
= 14/15 : 13/10 = 14/15 x 10/13 = 14/3 x 2/13 = 28/39