2019年春八年级数学下册第十六章二次根式16.1二次根式16.1.2二次根式的化简课件(新版)新人教版.pptx

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第2课时 二次根式的化简,学前温故,新课早知,2.当a0时,a的算术平方根是 ,0的算术平方根是 .,a,-a,0,学前温故,新课早知,5.用基本运算符号(基本运算包括加、减、乘、除、乘方和开方)把数或表示数的字母连接起来的式子称为 .,1,a,a,5,7,代数式,1.二次根式的非负性,2.利用二次根式的性质化简,1,2,3,4,5,6,1.计算 的结果是( ). A.2 B.-2 C.2 D.4,答案,1,2,3,4,5,6,答案,1,2,3,4,5,6,答案,解析,1,2,3,4,5,6,答案,1,2,3,4,5,6,答案,1,2,3,4,5,6,答案,

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