Before primary school ,l had two dreams,the one is that one day i can become a Chinese teacher,anoth
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Before primary school ,l had two dreams,the one is that one day i can become a Chinese teacher,another one is that in the future can be up to a writer.这段话有错误吗?
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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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