12.13.15.16.17.

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12.13.15.16.17.

12.13.15.16.17.
12.13.15.16.17.
 

12.13.15.16.17.
12.x²-1/3x+1
13.3
15.3
16.5
17.0.15a+0.4b
18.(-2)∧n-1·x∧n