初2英语作文或日记
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初2英语作文或日记
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Father’s DayYesterday was Father’s Day.I had planned to give my father a present.But I didn’t remember it until in the morning.It was too late to post a card to him.So I decided to buy something.Wh...
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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