问题
选择题
已知f(x)=
|
答案
定义域为R
∵f（-x）=
| e-x-ex |
| 2 |
∴f（x）是奇函数
∵ex是R上的增函数，-e-x也是R上的增函数
∴
| ex-e-x |
| 2 |
故选A
搜题请搜索小程序“爱下问搜题”
已知f(x)=
|
定义域为R
∵f（-x）=
| e-x-ex |
| 2 |
∴f（x）是奇函数
∵ex是R上的增函数，-e-x也是R上的增函数
∴
| ex-e-x |
| 2 |
故选A
| 完形填空。 | |||
| A teenage girl couldn't stand her parents' family rules, so she left home. She wanted to be 1 But she had poor education and several years later she had to ask for food on the street for a living. Now her father has died. Her mother is an old woman. But she is still 2 her daughter. She has been to every corner of the city. Everywhere she goes, she 3 a big photo of herself on the wall. At the lower part of the photo she writes," I still love you..., 4 home!" One day, the daughter saw one of the photos. The face was familiar (熟悉). "Is that my mother?" She moved closer and read the 5 : I still love you... She cried. When she got home, it was early morning. She 6 the door. The door opened itself. She rushed to her mother's 7 . Her mother was sleeping. She woke her mother up,"It's me! Your 8 is back home!" The mother and daughter held each other, full of 9 tears (眼泪). The daughter asked," Why is the door not locked? A thief could get in." The mother answered 10 , "The door has never been locked since you left." The door of parents' love for their children will never be closed. | |||
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