How be polite and safe的英语作文怎么样写
题目
How be polite and safe的英语作文怎么样写
答案
Everyone wants to be a person who is popular with his friends 、relatives and classmates .we also like to say "hello or how are you "to others in order to make ourselves to be polite .I will give you ...
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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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