Bonjour
a) -7-3+4-5+10-4+12-15
-7 -3 -5 -4 -15 +4 +10 +12
-34 + 26
-8
b) -5-(-6)+(-3)-8-(+3)
-5 + 6 -3 -8 -3
-5 -3-3-8 + 6
-19 + 6
-13
c) 15-(-6-3)-(7-(-2))
14 -(-9) -(7+2)
14 + 9 -9
14
d) -5-[(5-12)-(-5)]+(-4)
-5 -((-7) +5) -4
-5 -(-2) -4
-5 + 2 -4
-9 + 2
-7