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[函数] 取值范围

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乌贼 posted 2013-12-12 15:31 |Read mode
2013四川理数第十题,没有头绪,谁给解读。
211.png

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kuing posted 2013-12-12 15:49
你完全忘了你已经问过了吗?kkkkuingggg.haotui.com/viewthread.php?tid=1641

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其妙 posted 2013-12-12 17:46

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kuing posted 2013-12-12 18:43
回复 3# 其妙

这个就算了吧,都没证 $f(b)=b$,完全是考试场上的方法。

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其妙 posted 2013-12-12 19:40
回复  其妙

这个就算了吧,都没证 $f(b)=b$,完全是考试场上的方法。
kuing 发表于 2013-12-12 18:43
没仔细看,

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其妙 posted 2013-12-12 19:47

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original poster 乌贼 posted 2013-12-12 20:11
谢谢楼上各位,真到了健忘的岁数
主要是没掌握不动点知识和函数的增减性应用不到位。当复习

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其妙 posted 2013-12-12 20:32
回复 7# 乌贼
n你反正不是老师,也不是学生,是个数学爱好者,几何还做的那么好,这已经不错了!

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original poster 乌贼 posted 2013-12-12 20:44
回复 6# 其妙
连接中的根据题意$f(x)$的图像与直线$y=x$有唯一交点
怎么得出?

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kuing posted 2013-12-12 20:51
回复 9# 乌贼

显然那个链接里也没具体证明。

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original poster 乌贼 posted 2013-12-12 21:24
回复 10# kuing
再给一链接
   bbs.pep.com.cn/forum.php?mod=viewthread&tid=2847296
个人还是觉得2楼链接的好理解,推理也严密。可以不管不动点。

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其妙 posted 2013-12-13 12:25
回复 11# 乌贼
反证法+单调性就解决了吧?

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