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【简答题】
已知函数f（x）=lnx- 1 2 ax 2 -2x（a＜0） （1）若函数f（x）在定义域内单调递增，求a的取值范围； （2）若a=- 1 2 且关于x的方程f（x）=- 1 2 x+b在[1，4]上恰有两个不相等的实数根，求实数b的取值范围．
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参考答案：
举一反三
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honestly
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司马迁
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【单选题】Insurance companies provide a service to the community by protecting it against expected and unexpected disasters. Before an insurance company will agree to insure anything, it collects accurate figur...
A.
A passenger by air will take less risk of being killed than a man crossing a busy road.
B.
A passenger by air will take greater risk of being killed than a man crossing a busy road.
C.
A passenger by air will have to pay more to the insurance company than a mountain climber.
D.
A motorist should pay the highest price to the insurance company.
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【单选题】Which of the following statements is NOT TRUE?
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The work of community service takes volunteers little time.
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It is natural for most people to help others.
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Voluntary help is needed in many places.
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Community service means a lot to those who need help.
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相关题目：
【单选题】Insurance companies provide a service to the community by protecting it against expected and unexpected disasters. Before an insurance company will agree to insure anything, it collects accurate figur...
A.
A passenger by air will have to pay more attention to the insurance company than a mountain climber.
B.
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D.
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【单选题】Community service is a great way to help people in their time of need. It is great to see the happiness that results ______ it.
A.
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【多选题】数据加密技术的加密类型有
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B.
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C.
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【单选题】红葡萄酒的涩口感主要来自于果实的_____。
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【单选题】It is good for elderly people to be _________ involved in community service.
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honestly
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patiently
C.
eagerly
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【单选题】“哀而不伤,乐而不淫”是()对《关雎》的一个评价。
A.
司马迁
B.
孔子
C.
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【单选题】Insurance companies provide a service to the community by protecting it against expected and unexpected disasters. Before an insurance company will agree to insure anything, it collects accurate figur...
A.
A passenger by air will take less risk of being killed than a man crossing a busy road.
B.
A passenger by air will take greater risk of being killed than a man crossing a busy road.
C.
A passenger by air will have to pay more to the insurance company than a mountain climber.
D.
A motorist should pay the highest price to the insurance company.
查看完整题目与答案
【单选题】Which of the following statements is NOT TRUE?
A.
The work of community service takes volunteers little time.
B.
It is natural for most people to help others.
C.
Voluntary help is needed in many places.
D.
Community service means a lot to those who need help.
查看完整题目与答案
【单选题】下列属于氧化还原滴定法的是( )
A.
银量法
B.
酸碱法
C.
EDTA滴定法
D.
K 2 Cr 2 O 7 法
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【单选题】能不能作好反腐倡廉工作 人民群众最为关心的问题之一, 减少社会不公正现象的重要因素之一。 ,作好反腐倡廉工作 我们保持党的先进性的基本要求之一, 我们完成构建社会主义和谐社会历史重任的重要环节。
A.
既是    也是      并且      因为是        所以是
B.
既是    也是      同时      既然是        从而是
C.
是      也是      同时      还是          是
D.
是      也是      并且      无论是否      都是
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