Réponse (j'ai que la réponse du 1 mais ca peut t'aider) :
A= 6/5 - 17/14 : 5/7
A= 6/5 - 17/14 × 7/5
A= 6/5 - (17 × 7)/(7 × 2 × 5)
A= 6/5 - 17/10
6/5 = 12/10
A= 12/10 - 17/10 = (-5)/10
B= 2/3 + 1/3 × 5/4
B= 2/3 + 5/12
2/3 = 8/12
B= 8/12 + 5/12 = 13/12
C= (5/6)/(3/4)+(1/6)
3/4 = 18/24 ; 1/6 = 4/24
C= (5/6)/(18/24)+(4/24)
C= (5/6)/(22/24) = 5/6 : 22/24 = 5/6 × 24/22
C= (5×4×6)/(6×22) = (5×4)/22 = 20/22
20/22 = 10/11
C= 10/11
