Bonsoir, pouvez vous m’aidez pour compléter cet exercice :
a. (…) + 2 = -5
b. 13 - (…) = 15
c. 2,1 + (…) = 1,9
d. 23 + (…) = 21,5
e. (…) + 9,4 - 5 = 4
f. 3 + (…) - 4 + 7 = -3
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