In three minutes Gabrielle can walk 300 metros. In five minutes Mara can walk 600 meters. They
题目
In three minutes Gabrielle can walk 300 metros. In five minutes Mara can walk 600 meters. They
They started walking at the same time along the same track. How far apart were they after 4 minutes?
A. 80 meters B. 100 meters C. 120 meters D. 300 meters 要翻译 还有答案 过程详细
答案
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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