My bedroom

为了提高同学的英语写作水平,使大家在中考中立于不败之地,应广大师生的要求,我们开辟了"学生习作名师点评"栏目。同学们如果想让自己的英语习作得到名师的点评,请邮寄给我们。老师们如果发现自己学生的优秀习作需推荐的话,请按栏目要求邮寄给我们。     

My Dream Job

I want to be a good teacher when I was only nine years old.To be a good teacher is my dream job.I love kids.Don’t you think they are cute?If I have a chance to teach kids,I will try my best.I think learning is interesting.So I will let my students be interested in learning.Nothing in the world is difficult if you put your heart into it.I will make them face any problem and help them.I will make friends with them.But in class,I will be strict with     

关于一类矩阵乘积的初等变换求法

一般情况下,求两个矩阵的乘积都是利用定义法来解决的,本文讨论用初等变换的方法直接求可逆矩阵的乘积.