(江西专用)2019中考数学总复习第一部分教材同步复习第一章数与式第2讲数的开方与二次根式课件.ppt

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教材同步复习,第一部分,第一章 数与式,第2讲 数的开方与二次根式,2,知识要点 归纳,1定义与性质,知识点一 平方根、算术平方根、立方根与非负数的性质,3,4,2,3,2,2,5,知识点二 二次根式的概念与性质,大于或等于0,0,6,不含,7,a,|a|,a,a,8,x3,x1且x0,2,3,2,9,知识点三 二次根式的运算,10,4混合运算:二次根式的混合运算顺序与实数的混合运算顺序相同,加法交换律、加法结合律、乘法交换律、乘法结合律、乘法对加法的分配律以及多项式的乘法公式,都适用于二次根式的运算,0,6,11,知识点四 二次根式的估值步骤,12,B,13,江西5年真题 精选,命题点 平方根、算术平方根、立方根(5年1考),3,14,重难点 突破,重难点 二次根式的运算,难点,15,二次根式的混合运算应注意以下两点: (1)二次根式的混合运算顺序:先乘方,再乘除,最后加减,如果有括号,要先算括号里面的 (2)在二次根式的混合运算中,多项式的乘法法则和乘法公式仍然适用.,方法指导,

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