选修4-5:不等式选讲.
已知函数
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124148874591290/SYS201310251241488745912023_ST/0.png)
(e≈2.718…)
( I)若x
1,x
2∈[1,+∞),x
1≠x
2.求证:
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131025124148874591290/SYS201310251241488745912023_ST/1.png)
;
( II)若满足f(|a|+3)>f(|a-4|+1).试求实数a的取值范围.
考点分析:
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.
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