友情提醒可先通读全文,然后想一想每个技巧使用前是否有范围限制、使用时应注意什么、此类技巧主要应用在何处.适合人群不喜欢思考、只想知道如何解题的同学;想熟悉更多解题技巧的同学. Friendship reminder can read through the full text, and then think about the limits of each before the use of the scope of the use should pay attention to what such techniques are mainly applied where suitable for the crowd do not like thinking, just want to know how to solve problems of students Students who want to get familiar with more problem solving skills.