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.
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300-(17-18)-(16-17)-(15-16)-(14-15)-(13-14)-(12-13)-(11-12)计
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