求英语作文,题目是幸运数字
题目
求英语作文,题目是幸运数字
答案
The lucky-number has become increasingly popular in daily life of mordern socialty. For example, the number eight means big money which people like most, while the number four means death. Some peo...
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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