our school英语作文
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our school英语作文
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Our school is very beautiful.There are many trees and flowers here,so the air here is very clean.I can hear birds singing.It's so wonderful.On the playground,you can see the students play basketball.S...
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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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