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【单选题】
已知函数f(x)=x 2 -(a-2)x-aln x(a∈R).当a=1时,证明对任意的x>0,f(x)+e x >x 2 +x+2.证明过程当a=1时,f(x)=x 2 +x-ln x,要证明f(x)+e x >x 2 +x+2,只需证明 2 ,设g(x)=e x -ln x-2,则问题转化为证明 3 ,令g′(x)=e x - =0,得e x = ,容易知道该方程有唯一解,不妨设为x 0 ,则x 0 满足e x 0 = ,当x变化时,g′(x)和g(x)变化情况如下表 g(x) min =g(x 0 )=e x 0 -ln x 0 -2= +x 0 -2,因为x 0 >0,且x 0 ≠1,所以g(x) min > 4 ,因此不等式得证.在解答过程中,3处应该是( )A.
任意的x>0,g(x)<0
B.
任意的x>0,g(x)>0
C.
存在x>0,g(x)>0
D.
存在x>0,g(x)<0
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反馈参考答案：
举一反三
【单选题】______ is a mild, indirect or less offensive word or expressive one, so it is usually the substitution for taboo.
A.
Pun
B.
Slang
C.
Euphemism
D.
Metaphor
【简答题】机械加工工艺过程的基本组成单元是( )。
【单选题】It is usually the( )who It is usually the ()who issues relevant documents such as the Forwarders’ Certificate of Receipt, the Forwarders’Certificate of Transport, etc.
A.
consignor
B.
consignee
C.
freight forwarder
D.
carrier
【单选题】4It is usually the( )who It is usually the ()who issues relevant documents such as the Forwarders’ Certificate of Receipt, the Forwarders’Certificate of Transport, etc.
A.
consignor
B.
consignee
C.
freight forwarder
D.
carrier
【判断题】In a consolidation service,it is usually the buyer who issued to each seller his bill of lading.( )
A.
正确
B.
错误
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