We hit the track every Saturday for the six weeks preceding the race
题目
We hit the track every Saturday for the six weeks preceding the race
and his time slowly improved until he was making the finish line in just less than three minutes.
答案
我们击中轨道每一星期六六个星期前述的比赛和他的时间慢慢地改良了,直到他正在制造完成线在仅仅少于三分钟.
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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