Bonsoir a tous j'ai un devoir sur les fraction la plus simple possible je comprend rien a sa :S
Vous pouvez m'aider svp? Si possible developper mercii d'avance.
Voici les calcule:

a= 1/5 - 3/10 x 1/6 + 1/2
b= (1/5-3/10) x (1/6+1/2)
c= (1/8-7/12) (divisé) (6/5+4/15)
d= 1/8 -7/12 (divisé) 7/6 +7/12
e= (1/8+7/12) x (6/5(divisé)4/15)

Aidez moi svp, si possible developper les calcule.

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Réponses

2014-09-06T20:41:07+02:00
a = 1/5 - 3/10 x 1/6 + 1/2
a = 1/5 - 3/60 + 1/2
a = 1 x 12 / 5 x 12 - 3/60 + 1 x 30 / 2 x 30
a = 12/60 - 3/60 + 30/60
a = 39/60
a = 3 x 13 / 3 x 20
a = 13/20

b = (1/5 - 3/10) x (1/6 + 1/2)
b = (1 x 2 / 5 x 2 - 3/10) x (1/6 + 1 x 3 / 2 x 3)
b = (2/10 - 3/10) x (1/6 + 3/6)
b = - 1/10 x 4/6
b = - 4/60
b = 4 x - 1 / 4 x 15
b = - 1/15

c =  (1/8 - 7/12) : (6/5 + 4/15)
c = (1 x 3 / 8 x 3 - 7 x 2 / 12 x 2) : (6 x 3 / 5 x 3 + 4/15)
c = (3/24 - 14/24) : (18/15 + 4/15)
c = - 11/24 : 22/15
c = - 11/24 x 15/22
c = - 165/528
c = 33 x - 5 / 33 x 16
c = - 5/16

d = 1/8 - 7/12 : 7/6 + 7/12
d = 1/8 - 7/12 x 6/7 + 7/12
d = 1/8 - 42/84 + 7/12
d = 1 x 84 / 8 x 84 - 42 x 8 / 8 x 84 + 7 x 56 / 12 x 56
d = 84/672  - 336/672 + 392/672
d = 140/672
d = 28 x 5 / 28 x 24
d = 5/24

e = (1/8 + 7/12) x (6/5 : 4/15)

e = (1 x 3 / 8 x 3 + 7 x 2 / 12 x 2) x (6/5 x 15/4)
e = (3/24 + 14/24) x 90/20
e = 17/24 x 90/20
e = 1530/480
e = 30 x 51 / 30 x 16
e = 51/16