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10-9+9-8+8-7+...+3-2+2-1

Răspuns :

10-9=1
9-8-1
8-7=1
7-6=1
6-5=1
5-4=1
4-3=1
3-2=1
2-1=1 =>  =9
10-9+9=10-8+8=10-7+3-2+2-1=5