题目

根据要求，解答下列问题．仔细观察小聪同学所求的三个方程的解．①方程x2－2x＋1＝0的解为x1＝1，x2＝1；②方程x2－3x＋2＝0的解为x1＝1，x2＝2；③方程x2－4x＋3＝0的解为x1＝1，x2＝3； ………… （1） 根据以上方程特征及其解的特征，请猜想：①方程x2－9x＋8＝0的解为；②关于x的方程的解为x1＝1，x2＝n． （2） 请用配方法解方程x2－9x＋8＝0，以验证猜想结论的正确性．阅读理解： 　　　　Li Hua's father, Mr Li, is a factory worker. He works in a modern car factory. Their factory has got more robots than any 　　other factory in Shanghai. Mr Li works with the help of the robots.He works the hardest of all the workers in his factory. Every day 　　he gets up early and gets to the factory earlier than the others.He goes back home the latest. In the evening, he listens to the 　　English programme on the radio with Li Hua. They speak English with each other. Mr Li also helps his wife with the housework in his 　　spare（空闲的）time. Everybody says Mr Li is a model worker, a good husband（丈夫）and a nice father. 根据短文内容，选择最恰当的答案。 　　1. Li Hua's father works _____.　　　　　　　　[　　] 　　A. at home　　　　　　　 B. in a robot factory 　　C. in a car factory　　　D. in a radio factory 　　2. Mr Li's factory is _____ than other factories.[　　] 　　A. more modern　　　B. larger 　　C. smaller　　　　　D. less modern 　　3. Mr Li ____ the factory earlier than the others.[　　] 　　A. comes to　　　　　　　 B. leaves 　　C. begins to work in　　　D. finishes his work in 　　4. Mr Li leaves the factory ____.　　　　　　 [　　] 　　A. earlier than the others 　　B. later than the others 　　C. together with the other workers 　　D. with Li Hua 　　5. Which of the following is true?　　　　　　 [　　] 　　A. Both Mr Li and his wife do the housework. 　　B. Only Li Hua's mother does the housework. 　　C. Mr Li watches the English programme on TV everyday. 　　D. Mr Li is a good father and husband but not a good worker.