my happy day 的英语作文
题目
my happy day 的英语作文
答案
Today the weather was fine,cloudless.After breakfast I wash a face to brush my teeth,and just as often forget,the ball cheerfully came to the park to play.Ah,like the often forget,there was a park wit...
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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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