Réponses

Meilleure réponse !
2014-03-09T10:44:59+01:00
Salut :)

A = 12/25 : -8/15
A =12/25 x 15/-8
A = (4 x 3 x 3 x 12) / (5 x 5 x 5 x 3)
A = 12/25

B = 18/-27 x 11/-8
B = (9 x 2 x 11) / (9 x (-3) x 2 x (-4))
B = 11/12

C = 11/5 - 9/5 x 7/18
C = 11/5 - (9 x (-1) x 7) / (5 x 9 x 2)
C = 11/5 - 7/10
C = 22/10 - 7/10
C = 15/10
C = 3/2

D = (8/15 - 1/5) : 2/21
D = (8/15 - 3/15) : 2/21
D = 5/15 : 2/21
D = 5/15 x 21/2
D = (5 x 3 x 7) / (3 x 5 x 2)
D = 7/2

E = (2/3 + 1/6) / (1 - 1/3)
E = (4/6 + 1/6) / (3/3 - 1/3)
E = 5/6 / 2/3
E = 5/6 x 3/2
E = (5 x 3) / (3 x 2 x 2)
E = 5/4

J'espère t'avoir aidé(e)! :)
2014-03-09T10:54:56+01:00
A= 12/25 ÷ -8/15+ 12/25 * 15/-8 = -9/10

B= 18/27*11/-8=198/216=11/12

C= 11/5-9/5*7/18= 11/5-63/90= 198/90-63/90=135/90=3/2

D= (8/5-1/5)÷2/21= (8/15-3/15) ÷2/21= 5/15 ÷ 2/21=5/15*21/2=105/30=7/2

E= 2/3+1/6 sur 1-1/3= 5/6 ÷ 2/3= 5/6*3/2 = 15/12= 5/4