2019年春八年级数学下册第16章二次根式章目标总览(新版)新人教版.doc

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1第十六章 二次根式教材简析本章的内容主要包括:二次根式的概念和性质、二次根式的乘除、二次根式的加减在中考中,本章重在考查二次根式的概念和性质以及运用二次根式的运算法则进行化简、求值教学指导【本章重点】二次根式的性质和运算【本章难点】灵活运用二次根式的性质及运算法则进行相关的化简与实数的简单运算【本章思想方法】1掌握类比思想如:类比算术平方根的概念理解二次根式的性质,类比整式的运算法则理解二次根式的运算法则2掌握分类讨论思想如:在进行二次根式的化简时,当被开方数中有字母且没有给出字母的取值范围时,应考虑对字母的取值进行分类讨论3体会整体思想如:在求含有二次根式的代数式的值时,有时从整体角度考虑,将已知条件和待求值的式子进行变形后整体代入求值课时计划16.1 二次根式 2 课时16.2 二次根式的乘除 2 课时16.3 二次根式的加减 2 课时

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