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a2-a1 ? = a3-a2
1-3?=1/2-1
-2≠-1/2 odp. NIE
a1=1 a2=5 a3=8
5-1≠8-5 NIE
6-3≠12-6 odp. NIE
a1=2 a2=5 a3=8
odp. Tk bo 5-2=8-5