湖北省武汉市八年级数学下册第十六章二次根式16.1二次根式及运算导学提纲(无答案)(新版)新人教版.doc

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1二次根式及运算班级: 姓名: 小组: 评价: 【学习目标】熟练掌握二次根式有意义的条件,熟练进行二次根式的四则运算【重点难点】重点:熟练准确的进行二次根式的四则运算;难点:二次根式加减乘除乘方运算混合运算的准确率并能适当的选择简便运算方法【学法指导】复习巩固、自主积累【导学流程】思:1. 有意义的条件: 1. ( 0, 0) 逆用: baab( 0, 0) 逆用:2.二次根式加减时,可以先将二次根式化简成 ,再将被开方数 的二次根式进行合并。 3.二次根式的运算中,整式乘法法则和乘法公式仍然适用。 二、考题分类题型一:确定二次根式中被开方数所含字母的取值范围1、当 时, 在实数范围内有意义x3x2、 有意义的条件是 a4题型二: 二次根式的计算与化简3.下列各式中计算不正确的是( )A. B. C. D.5326323224、 (1)计算 (2)化简 842三 巩固训练1.计算与化简:(1) (2))681()24( 25431(3) (4))632)( 6)273-8((5) (6)2)3-( 12x(7) (8)2yx 23a3.已知 .的 值求 aa1,013堂测堂练: 1. 2. 85123 )23)(32(3. 4.2)5( 27)6418(

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