what are some of the difficulties of friendship?the greatest is the attraction to expert too much ti
题目
what are some of the difficulties of friendship?the greatest is the attraction to expert too much time.another difficulty is the selfishness to take actions too soon.
答案
朋友交际中都有什么困难?
最主要的是花费我们太多的时间
其他的就是以自我为中心采取行动
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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