Who would know,I have sad at heart,then hold me tight,and say,you still have
题目
Who would know,I have sad at heart,then hold me tight,and say,you still have
答案
谁会明白我心中的忧伤,抱紧我,对我说,你还有我.
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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