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Sagot :

Je crois que c’est :
1-> (1-2)-(-3+4)
1->-1+3+4
1->-1-4+3
1->-5+3
1->-2

2->(1- - 3)-(-2+-5)
2->1+3+2+5
2->11

3->(0- -2)-(-1-3)
3->0+2+1+3
3->6

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