我快乐的一天 英语作文 80字
题目
我快乐的一天 英语作文 80字
答案
a happy day Today,I got up very early,I had a very good breakfast,then I went out to play with my friend,We had a very good time.In the afternoon,I went swimming with my father,it was very hot,but we ...
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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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