People feel safe because malls have police station of private security guards.麻烦帮忙翻译
题目
People feel safe because malls have police station of private security guards.麻烦帮忙翻译
答案
由于商场中设置了负责顾客安保的警察点,所以人们有了安全感.
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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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