谁能帮我写英语作文,
题目
谁能帮我写英语作文,
Write a letter to your friends about your plan of your coming Winter Vacation with at least 80 words.
答案
The winter vacation is approaching!Though it will not be long,however,it has never more important for me,because this vacation is the last one in my life of senior high school.To make the full use of ...
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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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