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bonjour je voudriez que vous m'aidiez merci d'avance
A)2+7/5
B) -3-1/4
C) 3/7-4/7/(2/3+4/8)


Répondre :

bonjour

a = 10/5 + 7/5 = 17/5

b = - 12/4 - 1/4 = - 13/4

c = 3/7 - 4/7 : ( 16/24 + 12/24) 

c = 3/7 - 4/7 : 28/24

c = 3/7 - 4/7 x 3/7
c = 3/7 - 12/49
c =  21/49 - 12/49 = 9/49 
Bonjour,

A)2+7/5
= 2 x 5 / 1 x 5 + 7/5
= 10/5 + 7/5
= 17/5

B) -3-1/4
= - 3 x 4 / 1 x 4 - 1/4
= - 12/4 - 1/4
= - 13/4

C) 3/7-4/7/(2/3+4/8)
= - 1/7 : (2 x 8 / 3 x 8 + 4 x 3 / 8 x 3)
= - 1/7 : (16/24 + 12/24)
= - 1/7 : 28/24
= - 1/7 x 24/28
=  - 24/196
= 4 x - 6 / 4 x 49
= - 6/49