用how ofen,exercise,skateboard,hardly,program,active编写英文故事
题目
用how ofen,exercise,skateboard,hardly,program,active编写英文故事
答案
One day, Tom got a skateboard for his birthday. He wanted to do much exercise with it but he could hardly have time because of lot of his homework. Then he thought and thought and had a new program! H...
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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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