英语日记50字
题目
英语日记50字
答案
What a happy day!Today is Thursday and it's very hot!My brother and I went to swim in the swimming pool.There are a lot of children swimming and playing there.Everyone was smiling and happy.We were ve...
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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