an average of 和the average of的区别
题目
an average of 和the average of的区别
答案
the average of 是指具体的某事物的平均数,an average of是泛指某个平均数,不是特指的例如,the average of our wage is not very highwe have many books and we have an average of 35 books per person能体会吗?...
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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