小学四年级英语日记30字
题目
小学四年级英语日记30字
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I am very happy today for I had the chance to help the old people in our subdistrict.Nowadays,many adults are busy with therir job and have no time to take good care of their old parents.I want to try...
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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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