Bonjour,
A ) 13/7 - 20/7 = - 7/7 = - 1.
B ) - 5/4 + 2/3 = - 15/12 + 8/12 = - 7/12.
C ) 1/6 - 5/3 = 1/6 - 10/6 = - 9/6 = - 3/2.
D ) - 5/3 x 2/7 = - 10/21.
E ) 12/- 5 x - 15/8 = - 9/ - 2 = 9/2.
F ) 2/9 : - 7/5 = 2/9 x 5/- 7 = - 10/63.
G ) - 5/14 : - 10/- 21 = - 5/14 x - 21/- 10 = - 1/2 x - 3/- 2 = - 3/4.
J'espère avoir pu t'aider.
