龟兔赛跑,谁的本领大,狼和小羊,狐狸和乌鸦
题目
龟兔赛跑,谁的本领大,狼和小羊,狐狸和乌鸦
答案
A Fox once saw a Crow fly off with a piece of cheese in its beak and settle on a branch of a tree. ‘That’s for me, as I am a Fox,’ said Master Reynard, and he walked up to the foot of the tree. ‘G...
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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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