设f（x）=ex(x≤0)lnx(x＞0)，则f[f（13）]=______．_爱下问搜题

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问题填空题

设f（x）=

ex(x≤0)

ln x(x＞0)

，则f[f（

1

3

）]=______．

答案

因为f（x）=

ex(x≤0)

ln x(x＞0)

，

所以f（

1

3

）=ln

1

3

＜0，

所以f[f（

1

3

）]=f（ln

1

3

）=eln

1

3

=

1

3

，

故答案为

1

3

．

填空题

用方框中所给单词的适当形式填空.每词限用一次.

allow health busy fault different

1. This adds to the traffic and pollution, but it's not her _____________.
2. It's the _____________ season in China because of Spring Festival.
3. Ask him if he wants to write something about staying ______________.
4. In fact, even the simplest everyday activities can make a real ___________to the environment.
5. You are not _______________to touch the exhibits.

填空题

中国古代法律制度把“三纲”为核心的封建礼教作为指导立法、司法活动的基本原则。这“三纲“是指（）。