答案

1,1.9998

2,0.2357

3,0.2357

4,25.9174

5,26.6243

6,26.3450

8,3/2*x^4-4/3*x^3+1/2*b*x^2-5*x

 9,-cos(a)  

10,2/3*x^(3/2)  

11,2/3*b^(3/2)- 2/3*a^(3/2)

12,2/25*15^(1/2)-1/6*2^(1/2)  

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