函数f（x）=（x-1）2（x-2）2的极大值是______．
∵f（x）=（x-1）2（x-2）2，∴f′（x）=2（x-1）（x-2）（2x-3）；
令f′（x）=0，得可能的极值点x1=1，x2=
，x3=2．列表如下：3 2
| x | （-∞，1） | 1 | （1，
|
| (
| 2 | （2，+∞） | ||||||
| f′（x） | - | 0 | + | 0 | - | 0 | + | ||||||
| f（x） | ↘ | 极小值 | ↗ | 极大值 | ↘ | 极小值 | ↗ |
| 3 |
| 2 |
| 1 |
| 16 |
故答案为
．1 16
| 完形填空。 | ||||
| The tourism has become a very big 1 . Millions of people now 2 their holidays in other countries. The travel companies say that spending holidays in 3 places can help people to understand each other better. This can help towards peace (和平) and love among the 4 . These ideas may bring good business, 5 they aren't true to life. Very 6 of today's tourists want to know the people of the countries they are _7 . They just want a week or two of sunshine to lie on the 8 ___ by the sea. Most tourists do not want to discover things for 9 . They 10 want to travel and stay with their own families or friends for the whole holidays. The tourist business is really very easy for the travel companies. | ||||
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