Bonjour:
a)
7-4 = 3
3+3= 6
6-5 = 1
1+4 =5
5-10 = -5
b)
4-7 = -3
-3 -2 =-5
-5 +2 =-3
-3 -5=-8
-8 -7= -15
-15 +12 = -3
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Bonjour:
a)
7-4 = 3
3+3= 6
6-5 = 1
1+4 =5
5-10 = -5
b)
4-7 = -3
-3 -2 =-5
-5 +2 =-3
-3 -5=-8
-8 -7= -15
-15 +12 = -3