麻烦帮帮忙,急求人教版九年级英语Unit8 3a原文
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麻烦帮帮忙,急求人教版九年级英语Unit8 3a原文
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Being a volunteer is great!Number 77 High School is home to three very special young people:Lin Pei and Zhu Ming.These three students all volunteer their time to help other people.This volunteer work ...
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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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