How to live a worthy life?
题目
How to live a worthy life?
有谁能帮我写这篇作文,急用
答案
most of us may have asked ourselves the same question at some point of our life:what am i living for,what should i do with my life?this is surely a very big question.if you start to ask this question,...
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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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