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[函数] 函数定义域和值域问题

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lrh2006 posted 2014-8-25 17:54 |Read mode
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第(2)问在某区间有意义,这个区间是定义域吗?第(3)问值域已知,定义域是R呢还是可以有限制?
麻烦告知第(2)(3)(4)问怎么做?谢谢

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kuing posted 2014-8-25 17:59
第(2)问在某区间有意义,这个区间是定义域吗?
NO

第(3)问值域已知,定义域是R呢还是可以有限制?
“自然定义域”

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original poster lrh2006 posted 2014-8-26 11:02
回复 2# kuing

“自然定义域”是什么,是说定义域不一定是R吗?

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kuing posted 2014-8-26 12:20
回复 3# lrh2006

就是由解析式自己来确定的范围

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original poster lrh2006 posted 2014-8-27 08:43
回复 4# kuing


    嗯,知道了,谢谢kuing神.

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