求新概念英语第二册原文15课~25课
题目
求新概念英语第二册原文15课~25课
答案
Lesson 15 Good news The secretary told me that Mr.Harmsworth would see me.I felt very nervous when I went into his office.He did not look up from his desk when I entered.After I had sat down,he said t...
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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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