Réponse :
Explications étape par étape
Bjr,
a)
-7/5 -9/5 = -16/5
b)
-13/14 -(-8/14) = -13/14 +8/14 = - 5/14
c)
-1/2 = - 3/6
5/6 +3/6 = 8/6 = 4/3
d)
1/10 -3/10 = -2/10 = -1/5
e)
4/7 -(-1/7) = 4/7 +1/7 = 5/7
f)
11/9 = 22/18
5/6 = 15/18
22/18 -15/18 = 7/18
☺