设函数f(x)=alnx-bx
2(x>0);
(1)若函数f(x)在x=1处与直线
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相切
①求实数a,b的值;
②求函数
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231447057508146/SYS201311012314470575081021_ST/1.png)
上的最大值.
(2)当b=0时,若不等式f(x)≥m+x对所有的
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131101231447057508146/SYS201311012314470575081021_ST/2.png)
都成立,求实数m的取值范围.
考点分析:
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