┃1/2007-1/2006┃+┃1/2006-1/2005┃+┃1/2005-1/2004┃-┃1/2004-1/2007┃
题目
┃1/2007-1/2006┃+┃1/2006-1/2005┃+┃1/2005-1/2004┃-┃1/2004-1/2007┃
答案
|1/2007-1/2006|+|1/2006-1/2005|+|1/2005-1/2004|-|1/2004-1/2007|=[-(1/2007-1/2006)]+ [-(1/2006-1/2005)]+ [-(1/2005-1/2004)]-(1/2004-1/2007)=-1/200+1/2006-1/2006+1/2005-1/2005+1/2004-1/2004+1/2007=0
举一反三
已知函数f（x）=x，g（x）=alnx，a∈R．若曲线y=f（x）与曲线y=g（x）相交，且在交点处有相同的切线，求a的值和该切线方程．
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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