Yesterday I had a walk with a friend in the street.When we were passing by a house全文,
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Yesterday I had a walk with a friend in the street.When we were passing by a house全文,
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I was on a walk with a friend yesterday when I found a BlackBerry cell phone in a puddle of melted snow.I picked it up and it still worked!I started scrolling through the contact list and calling numb...
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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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