25th 26th 28th 30th 31st英文咋写?
题目
25th 26th 28th 30th 31st英文咋写?
答案
25th - Twenty-fifth
26th - Twenty-sixth
28th - Twenty-eighth
30th - Thirtieth
31st - Thirty-first
举一反三
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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