帮我写一篇关于周末活动的英语作文,80词左右就行.
题目
帮我写一篇关于周末活动的英语作文,80词左右就行.
答案
My Happy Weekend I was so busy and had to do so many things on last weekend. I finished my homework on Saturday morning. In the afternoon, I helped my mother with housework. Because I am a good ...
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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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