Bonjour, quelqun peut m'aider svp 15 points !!!!

Calculer les expressions suivantes :

A. (-4) + (-3) :
B. (+3) - (-4) :
C. (-3,5) - (2,5) :
D. 7 - 11 : -4
E. (-7) - (5) :
F. 4 + (+5) - (+2) + (+3) :
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