已知
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231426650118380/SYS201311012314266501183010_ST/0.png)
,其中m、n为实数,则m+n=
.
考点分析:
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在R上可导的函数f(x)=
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,当x∈(0,1)时取得极大值.当x∈(1,2)时取得极小值,则
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的取值范围是( )
A.
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B.
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C.
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D.
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设函数y=f(x)在(-∞,+∞)内有定义.对于给定的正数K,定义函数
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取函数f(x)=2-x-e
-x.若对任意的x∈(+∞,-∞),恒有f
k(x)=f(x),则( )
A.K的最大值为2
B.K的最小值为2
C.K的最大值为1
D.K的最小值为1
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函数y=sinx,y=cosx在区间
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内围成图形的面积为( )
A.
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B.
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C.
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D.
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(1)若z∈C,则z
2≥0;
(2)a,b∈R且a=b是(a-b)+(a+b)i为纯虚数的充要条件;
(3)当z是非零实数时,
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恒成立;
(4)复数的模都是正实数.
其中正确的命题有( )个.
A.0
B.1
C.2
D.3
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将平面向量的数量积运算与实数的乘法运算相类比,易得下列结论:
(1)
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231426650118380/SYS201311012314266501183005_ST/0.png)
;
(2)
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231426650118380/SYS201311012314266501183005_ST/1.png)
;
(3)
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231426650118380/SYS201311012314266501183005_ST/2.png)
;
(4)由
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可得
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231426650118380/SYS201311012314266501183005_ST/4.png)
.
以上通过类比得到的结论正确的有( )
A.1个
B.2个
C.3个
D.4个
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