THE BEST GIFT I HAVE EVER RECEIVED英语作文
题目
THE BEST GIFT I HAVE EVER RECEIVED英语作文
答案
So far,I have received a lot of gifts.However,the best gift I have ever received is a card from my best friend who has moved to the other city.这个只能输100字
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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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