the effect of playing computer games on the students academic performance
题目
the effect of playing computer games on the students academic performance
the introduction for that topic..please!
give me one paragraph.about 200 words.thank you very ...much!
答案
if you take much time to play computer games .you can not take more time on study.
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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