Calculez les expressions: a) 1/3 + 5/9
b) 11/6 + -7/3
c) 17/24 - -5/6
a) 2/3+1/8
b) -2/5 + 3/4
c)-5/7 - 3/2
d) 4/7 - 4/5
e) 3- 5/7
f) -2 - 3/4
b) 11/6 + -7/3
c) 17/24 - -5/6
a) 2/3+1/8
b) -2/5 + 3/4
c)-5/7 - 3/2
d) 4/7 - 4/5
e) 3- 5/7
f) -2 - 3/4
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