问题
选择题
把3an+2+15an-1-45an分解因式是（ ）
A．3（an+2+5an-1-15an）
B．3an（a2+5a-1-15）
C．3an-1（a3+5-15a-1）
D．3an-1（a3+5-15a）
答案
3an+2+15an-1-45an=3an-1（a3+5-15a），
故选：D．
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把3an+2+15an-1-45an分解因式是（ ）
A．3（an+2+5an-1-15an）
B．3an（a2+5a-1-15）
C．3an-1（a3+5-15a-1）
D．3an-1（a3+5-15a）
3an+2+15an-1-45an=3an-1（a3+5-15a），
故选：D．
阅读短文,根据其内容完成下列表格。下面是李国龙先生写的求职信及个人简历，请根据信的内容，将其简历补充完整（每空不超过两个单词）。 73 Xinchang Road, Beijing June 7, 2008 Dear sir, I am writing to introduce myself, with the hope of getting the job you advertised in Daily News. When I was a child, I was fond of English and always got good grades. In 1994, after six years of hard work in Beijing No. 4 Middle School, I entered People’s University. I studied English there for four years. Luckily, I got my first job when I graduated. I taught English in Beijing No. 4 Middle School from 1998 to 2001. Then I got the chance to receive further education in University of Hawaii in the US. That was a precious experience of my life. I learnt a lot during those two years, especially the differences between eastern and western cultures. I came back to People’s University in 2003. I worked as an assistant(助手) for 2 years and then as a professor. So far, I have got 8 years of working experience. I won lots of awards. I was an “Excellent Student” of People’s University in 1997, and “Outstanding Teacher” of Beijing No. 4 Middle School in 2000. Thank you for reading my letter, and I will appreciate it very much if you can reply soon. Yours sincerely Li Guolong
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