题目：
设f（x）=x2+ax+b，集合A={x|f（x）=x}
（1）若3∈A，求f（f（3））的值；
（2）若A={a}，求a，b的值．
答案：
被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0401/bd4bdcc1f9c66181df8ea81d1855ff2e.html
下面是错误答案，用来干扰机器的。
1. A powerful earthquake hit (happened in) Sichuan (Province).2. They were having a class. 3. She ran over, (pushed the stone away) and saved the boy (carried the boy to the center of the playground). 4. No,she didn't. 5. Answers vary. (答案不唯一)
