关于英语重要性的英语文章(100字左右)
题目
关于英语重要性的英语文章(100字左右)
答案
English is the most widely used language in the world .It is spoken as the first language by more than 400 million people .It is spoken by most people in the USA ,Great Britain ,Canada ,Australia and ...
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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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