函數(shù)f(x)=lnx-12x2的大致圖象是( ?。?A. B. C. D.
函數(shù)f(x)=lnx-
x2的大致圖象是( ?。?br/>A. ![](http://hiphotos.baidu.com/zhidao/pic/item/96dda144ad345982dbe7d2250ff431adcbef8413.jpg)
B.![](http://hiphotos.baidu.com/zhidao/pic/item/30adcbef76094b36dcff2c5aa0cc7cd98d109d13.jpg)
C.![](http://hiphotos.baidu.com/zhidao/pic/item/8c1001e93901213fc05e796b57e736d12f2e9513.jpg)
D.![](http://hiphotos.baidu.com/zhidao/pic/item/1b4c510fd9f9d72a2a6b27aad72a2834349bbb7d.jpg)
1 |
2 |
![](http://hiphotos.baidu.com/zhidao/pic/item/96dda144ad345982dbe7d2250ff431adcbef8413.jpg)
B.
![](http://hiphotos.baidu.com/zhidao/pic/item/30adcbef76094b36dcff2c5aa0cc7cd98d109d13.jpg)
C.
![](http://hiphotos.baidu.com/zhidao/pic/item/8c1001e93901213fc05e796b57e736d12f2e9513.jpg)
D.
![](http://hiphotos.baidu.com/zhidao/pic/item/1b4c510fd9f9d72a2a6b27aad72a2834349bbb7d.jpg)
數(shù)學人氣:851 ℃時間:2019-08-21 07:36:14
優(yōu)質(zhì)解答
∵f(x)=lnx-12x2,其定義域為(0,+∞)∴f′(x)=1x-x=(1?x)(1+x)x,由f′(x)>0得,0<x<1;f′(x)<0得,x>1;∴f(x)=lnx-12x2,在(0,1)上單調(diào)遞增,在(1,+∞)上單調(diào)遞減;∴x=1時,f(x)取到...
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