英语数学题意思不太明白.
题目
英语数学题意思不太明白.
during a sale at an office supply store,for every box of paper clips purchased for 15cents,a second box can purchased for 4cents.How many boxes of paper clips did Paul buy if he spent 91cents on boxes of paper clips?
那个 a second box ,翻译为第二盒么?
答案
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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