谁能给我一份英语情景对话
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谁能给我一份英语情景对话
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偶遇 Hi Tom!Hi Cathy!What are you doing here?I come to visit my tutor Bettina,and you?I am living here!Oh,what a coincidence!Yeah,would you like a cup of coffee?I would love to,but I have an appointme...
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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