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对任意非零实数a、b,规定a⊗b的运算原理如图所示,则=( ) A. B. C....
对任意非零实数a、b,规定a⊗b的运算原理如图所示,则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182617818462787/SYS201310241826178184627003_ST/0.png)
=( )
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182617818462787/SYS201310241826178184627003_ST/images1.png)
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182617818462787/SYS201310241826178184627003_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182617818462787/SYS201310241826178184627003_ST/2.png)
C.1
D.-1
考点分析:
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的展开式中,常数项等于15,则实数a=( )
A.1
B.±1
C.2
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函数
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设数列{a
n}的前n项和为S
n,数列{b
n}满足:b
n=na
n,且数列{b
n}的前n项和为(n-1)S
n+2n(n∈N
*).
(1)求a
1,a
2的值;
(2)求证:数列{S
n+2}是等比数列;
(3)抽去数列{a
n}中的第1项,第4项,第7项,…,第3n-2项,…余下的项顺序不变,组成一个新数列{c
n},若{c
n}的前n项和为T
n,求证:
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.
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