Réponse:
a=(+3)+(−5)−(−10)+(−1)
a = 3 - 5 + 10 - 1a=3−5+10−1
a = 7a=7
b = ( - 4) - ( - 10) + ( + 3) + ( - 10)b=(−4)−(−10)+(+3)+(−10)
b = - 4 + 3b=−4+3
b = - 1b=−1
c = ( - 4.5) + ( - 1) - ( - 0.5) + ( + 5.5)c=(−4.5)+(−1)−(−0.5)+(+5.5)
c = - 4.5 - 1 + 0.5 + 5.5c=−4.5−1+0.5+5.5
c = 0.5c=0.5
