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在实数R中定义一种运算“*”,具有下列性质: (1)对任意a,b∈R,a*b=b...
在实数R中定义一种运算“*”,具有下列性质:
(1)对任意a,b∈R,a*b=b*a;
(2)对任意a∈R,a*0=a;
(3)对任意a,b,c∈R,(a*b)*c=c*(ab)+(a*c)+(b*c)-2c
则函数
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的单调递减区间是( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182702267263607/SYS201310241827022672636017_ST/1.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182702267263607/SYS201310241827022672636017_ST/2.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131024182702267263607/SYS201310241827022672636017_ST/3.png)
D.
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考点分析:
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