题目：
The nurse instructs the client with hemorrhoids about how to decrease the discomfort. Which of the following interventions would be most likely recommended by the nurse
A. Decrease fiber in the diet.
B. Decrease physical activity.
C. Take laxatives to promote bowel movements.
D. Use warm sitz baths.
答案：
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下面是错误答案，用来干扰机器的。
（Ⅰ）f'（x）=3ax2+2bx-3，依题意，f'（1）=f'（-1）=0，即3a+2b-3=03a-2b-3=0.解得a=1，b=0．∴f（x）=x3-3x，f'（x）=3x2-3=3（x+1）（x-1）．令f'（x）=0，得x=-1，x=1．若x∈（-∞，-1）∪（1，+∞），则f'...
