已知函数f（x）是定义在实数集R上的不恒为零的偶函数，且对任意实数x都有xf（x+1）=（1+x）f（x），则f（f（
|
由xf（x+1）=（1+x）f（x）可得
f(3 2
)=5 2
f(5 2
)，3 2
f（1 2
）=3 2
f（3 2
）1 2
-
f（1 2
）=1 2
f（-1 2
）又∵f（1 2
）=f（-1 2
）1 2
∴f（
）=0，f（1 2
）=0，f（3 2
）=05 2
又∵-1×f（-1+1）=（1-1）f（-1）
∴-f（0）=0f（-1）=0
即f（0）=0
∴f（f（
））=f（0）=05 2
故答案为：0
| 根据对话内容，从下面方框中选择适当的单词或短语填空。 | |
B: I was at home. I was doing my homework. A: I called you dozens of times but no one 1 . B: I didn't hear the phone. Oh, my father was watching TV all evening.Why did you call? A: I wanted to talk to you about something. I was reading an English book. B: Were you reading a story? A: Yes. It's about a girl called Alice and 2 strange animals and people. Alice was sitting with her sister by the river. Then a white rabbit ran past her. It was very out of breath and it was 3 a watch. B: Ah, I know! Was there a King and a Queen? A: Yes, the Queen was playing in the garden and the King was sitting on the grass. B: And a cat? A: Yes, it was sitting in a tree and it was 4 . B: And was there a Mad Hatter, a March Hare and a mouse? A: Yes, they were having a tea party. Do you know the book? B: Yes, I do. It's a very 5 story, Alice's Adventures in Wonderland, every boy and girl in Britain has read it: The rabbit was running because it was late. Then Alice fell down the rabbit hole… and went into their strange world! 1._____ 2._____ 3._____ 4._____ 5._____ |