2018_2019学年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练习(新版)新人教版.doc

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1、1第 2课时 二次根式的性质1下面代数式的值不能等于 0的是( )A a2 B.a0 C D.|a|a22018无锡下列等式正确的是( )A( )23 B. 33 3 2C 3 D.( )2333 332018雁江区模拟若 a0,则 a的取值范围是( )a2A a0 B.a0C a0 D.a04文文设计了一个关于实数运算的程序,按此程序,输入一个数后,输出的数比输入的数的平方小 1.若输入 ,则输出的结果为( )7A5 B.6 C7 D.85若 是整数,则正整数 n的最小值为 .20n6化简或计算:(1) ; 3 3 2(2) (a0);9a2(3) ( )2 .916 2 2 47计算:(1

2、) 22 1 (4);(3)2(2)(1) 0 .|3 | 3 282018自贡期末实数 a、 b在数轴上对应点如图 1612 所示,化简 b2| a|的结果是( ) a b 2图 1612A2 a B.2bC2 b D.2 a92018雅安如果| x8|( y2) 20,那么 .xy10若 x, y为实数,且 y 4,则 x y .x2 9 9 x211阅读下面的解题过程,并回答问题化简:( )2|1 x|.1 3x解:由 13 x0,得 x ,131 x0,原式(13 x)(1 x)13 x1 x2 x.按照上面的解法,试化简: ( )2. x 3 2 2 x122018自贡期末实数 a, b在数轴上的位置如图 1613 所示,请化简:|a b| .a2 a b 2图 1613313若|63 m|( n5) 23 m6 ,则 m n . m 3 n2参考答案第 2课时 二次根式的性质【分层作业】1B 2.A 3.B 4.B 5.56(1)3 (2)3 a (3)1 7.(1)5 (2)138B 9.4 10.1 或7 11.112 a 13.2

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