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数轴、相反数和绝对值是中学数学中及其重要的概念,这节内容既是七年级教材的一个重点,又是难点,与绝对值有关的题目在各类考试中经常出现,题型灵活多变,技巧性强,它的应用十分广泛,因此我们对它应该引起足够重视.数轴能形象的表示数.很具体、直观,就连绝对值符号也得到形象地体现,通过数轴把有理数的大小、相反数分别与绝对值联系在一起.数轴的概念:把规定了原点,正方向,单位长度的一
The number of axes, the opposite number and absolute value of high school mathematics and its important concept, this section is not only a seventh grade textbook is a key, but also difficult, and the absolute value of the topics often appear in various exams, more flexible question type Variable, highly skilled, and its wide range of applications, so we should pay enough attention to it. The number of axis can represent the number of images. Very specific and intuitive, even the absolute value of the symbol is also vividly reflected by the rational number of axes , The opposite number is associated with the absolute value of the number of axes concept: the provisions of the origin, the positive direction, the unit length of a