亚马逊河的英文简介
题目
亚马逊河的英文简介
关于亚马逊河的基本情况
答案
The Amazon river has a series of major river systems in Peru and Ecuador, some of which flow into the Marañón and Ucayali, others directly into the Amazon proper. Among others, these include t...
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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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