What do you think of ads
题目
What do you think of ads
答案
Nowadays,more and more advertisements appear on newspapers,broadcasts,magazines as well as streets.People have different views on advertisements.Some people think advertisements can help people to hav...
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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