在掌握好数列极限的概念与方法的前提下，可以顺利地学好函数的极限，只需要注意在函数极限问题里，自变量的趋向应包括以下 6 种情况：

n阶行列式是一个数，是由 个数排成行列的方阵

矩阵的初等行（列）变换： （１） 交换第i行（列）和第 j 行（列）； （２） 用一个非零常数乘矩阵某一行（列）的每个 元素；

一、初等代数 1． 乘法公式与因式分解

一、基本问题 1．两点间距离公式

重要公式与结论 （1） ( ) 1−= ( ) APAP （2） ( ) () () ( ) +=∪ − ABPBPAPBAP

第一章图画图表作文常用语言及通用句式 第二章写作开头段、正文段、结尾段通用句式 第三章写作常用的表衔接的语言 第四章各类话题常用语言总结

Many people appreciate the conve iences of the city The city has better transportation service and health care

modern life becoming faster and faster both parent and child are too busy to spare enough time to exchange ideas, even if Today more and more advertisement are seen on the Tv screen It's difficult to they find it necessary to communicate

friends. Whatever the comment, true As a human being, one can hardly do friendship must be firmly based on trust without a friend. As the old saying goes ng. If a friendsh no man is an island In other words, no stand the test of a difficult experience and one can survive without the help and if one feels confident that, no matter friendship of others. And every sign