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在用数学归纳法证明(n+1)(n+2)…(n+n)=2n•1•2•3•…•(2n...
在用数学归纳法证明(n+1)(n+2)…(n+n)=2
n•1•2•3•…•(2n-1)(n∈N
*)时,从k到k+1,左端需要增加的代数式是( )
A.2k+1
B.2(2k+1)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224442435038810/SYS201311012244424350388006_ST/0.png)
D.
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对
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大前提
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,小前提所以
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,结论以上推理过程中的错误为( )
A.小前提
B.大前提
C.结论
D.无错误
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设曲线
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在点(3,2)处的切线与直线ax+y+1=0垂直,则a=( )
A.2
B.
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C.
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D.-2
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下面使用类比推理恰当的是( )
A.“若a•3=b•3,则a=b”类推出“若a•0=b•0,则a=b”
B.“若(a+b)c=ac+bc”类推出“c=ac•bc”
C.“(a+b)c=ac+bc”类推出“
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=
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+
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(c≠0)”
D.“(ab)
n=a
nb
n”类推出“(a+b)
n=a
n+b
n”
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若复数
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,则它的共轭复数
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的虚部是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101224442435038810/SYS201311012244424350388001_ST/2.png)
B.
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C.
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D.
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若f(x)=sinα-cosx,则f′(α)等于( )
A.cosα
B.sinα
C.sinα+cosα
D.2sinα
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