英语翻译
题目
英语翻译
an old friend of mine telephoned me from the railway station to tell me that he had come from Canada and was going to stay with me .i was still at the office at that time,so after explaining where my flat was.i told him that i had leftthe key under the doormat.as i would be home very late,i told him to help himself to some food and drink
答案
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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