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2019年春八年级数学下册第十六章二次根式16.1二次根式第2课时二次根式的性质课件（新版）新人教版.ppt

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第2课时 二次根式的性质,1.二次根式的性质 (1) 0(a0); (2) = (a0);( )2= (a0). 2.代数式 用基本运算符号(基本运算包括加、减、乘、除、乘方、开方)把 或表示数的 连接起来的式子,称为代数式.单独的一个数或字母也是代数式.,a,a,数,字母,a,(-2)2,a,1.7,(1)当a0时,( )2= =a. (2)当a0时, =|a|=-a.,B,C,C,2,

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