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问题 解答题
已知a2-4a-1=0．求a-
1
a
、（a+
1
a
）2的值．
答案

∵a2-4a-1=0，

∴a≠0，

∴a-4-

1
a
=0，

∴a-

1
a
=4；

（a+

1
a
）2=（a-
1
a
）2+4=16+4=20．

单项选择题

To assess the client’s dorsalis pedis pulse, the nurse should palpate the

A. medial surface of the ankle.
B. lateral surface of the ankle.
C. ventral aspect of the top of the foot.
D. medial aspect of the dorsum of the foot.
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选择题

It's raining. You must ride your bike as ____ as ____.        [ ]

A. careful, possible    

B. careful, you can  

C. carefully, you can
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