sunny day英语作文
题目
sunny day英语作文
答案
A Sunny Day Today is a sunny day,the sun is exposed he's read head,and he's smiley face.Some people are take there quilt drying; some children are play in the playground ,No body want stay at home ,al...
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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