英语谜语(打一物品,可用中文回答)
题目
英语谜语(打一物品,可用中文回答)
I am a small house,but I have no house,no sofas,no tables
I am a small house,but nobody lives in
In the early morning I open the door,four wheels are coming out
In the late afternoon I open the door again,the four wheels are coming back.
What am I?
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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