look up on the blackboard hung in front of the shop这句话改错
题目
look up on the blackboard hung in front of the shop这句话改错
look at on the blackboard hanging in front of the shop?
答案
look at the blackboard hung in the front of the shop
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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