Simplifier certaines fractions puis calculer:

a) 4 21
_ + _
5 -35

b) -8 1
_ + _
12 6

c) 24 -16
_ + _
15 20

d) 2 30
_ - _
3 18


e) -27 5
_ - _
12 4

f )48 12
_ - _
30 40
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