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中考动向分析 实数是初中数学的基础内容之一,也是学 习其他学科的基础.本单元的基本概念较多, 对所有的概念要牢固掌握,特别是绝对值的意 义的理解,会求实数的绝对值,掌握绝对值的 非负性及其应用,会灵活地进行实数的混合运 算.要真正掌握数形结合的思想,理解数轴上 的点与实数之间的一一对应关系,并能灵活地 加以运用.要注意本单元的知识点与其他知识 点的结合,以及在日常生活中的运用,还要注 意新的题型的积累. 代数式在整个初中代数的学习中起着重 要的作用.一般以填空题、选择题的形式考查 列代数式和求代数式的值,有关观察、归纳、猜 想的问题,是近几年中考命题的一个热点,要 能够认真分析问题,探寻规律,正确地列出代 数式.要能掌握整式中同类项、分式的基本性 质、最简二次根式、同类二次根式等概念,并能 灵活地运用.对于a2~(1/a2)形式的二次根式的化 简,要注意题目中的条件和隐含的条件,有时 要加以讨论才能得出结果,要注重培养分类讨 论的思想.
The analysis of moving trends in the examination is one of the basic contents of junior high school mathematics, and it is also the basis for learning other disciplines. The basic concepts of this unit are more, all concepts must be firmly grasped, especially the understanding of the meaning of absolute values, will be absolute Values, mastering the nonnegativity of absolute values and their applications, will be flexible to perform real-valued mixed operations. To really grasp the idea of combining numbers and shapes, to understand the one-to-one correspondence between points on the axis and real numbers, and to be able to flexibly Use it. Pay attention to the combination of knowledge points of this unit and other knowledge points, and use in daily life, but also pay attention to the accumulation of new types of questions. Algebraic formula plays an important role in the learning of algebra in the entire junior middle school. The questions of column algebraic expressions and algebraic expressions are examined in the form of blank-filling questions and multiple-choice questions. The issues concerning observation, induction, and conjecture are a hot topic in recent years’ examination propositions. It is necessary to be able to seriously analyze problems, find out laws, and correctly list algebraic expressions. It is necessary to be able to grasp the concepts of the same type of items, the basic nature of fractions, the simplest secondary roots, the same secondary roots, etc., and be able to use them flexibly. For a2~(1/a2) In the form of secondary rooted simplifications, attention should be paid to the conditions and implied conditions in the title. Sometimes it is necessary to discuss them before they can come to a conclusion. We must pay attention to cultivating ideas for classification and discussion.