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.x²－1/3x+113.315.316.517.0.15a+0.4b18.(-2)

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

12.13.15.16.17. 15.16.17. 15.16.17. 15.16.17. 10.12.13.14.15.16.17. 13.14.15.16.17. 15.16.17.题咋做, 求第15.16.17. 9.10.11.12.13.14.15.16.17. 15.16. 15.16, 15.16. 15.16. 15.16. 15.16. 15.16. 15.16 15.16