my father has a very busy day 作文
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my father has a very busy day 作文
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My father keeps busy every day. Yesterday, when he got up in the moring, he cooked breakfast for me. After breakfast, he took me to school. Then he went to the workplace to work. In the day time, he w...
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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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