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【323291】2023八年级数学上册 第3章 实数3.1 平方根练习(新版)湘教版

时间:2025-01-15 20:29:15 作者: 字数:2332字
简介:


3.1平方根

随堂检测

1 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/61/" title="平方" class="c1" target="_blank">平方</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/908/" title="平方根" class="c1" target="_blank">平方根</a> 的算术平方根是  <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/61/" title="平方" class="c1" target="_blank">平方</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/908/" title="平方根" class="c1" target="_blank">平方根</a> 的算术平方根___ __

2、一个数的算术平方根是9,则这个数的平方根是

3、若 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/61/" title="平方" class="c1" target="_blank">平方</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/908/" title="平方根" class="c1" target="_blank">平方根</a> 有意义,则x的取值范围是 ,若a≥0,则 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/61/" title="平方" class="c1" target="_blank">平方</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/908/" title="平方根" class="c1" target="_blank">平方根</a> 0

4、下列叙述错误的是( )

A-416的平方根 B17 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/61/" title="平方" class="c1" target="_blank">平方</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/908/" title="平方根" class="c1" target="_blank">平方根</a> 的算术平方根

C <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/61/" title="平方" class="c1" target="_blank">平方</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/908/" title="平方根" class="c1" target="_blank">平方根</a> 的算术平方根是 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/61/" title="平方" class="c1" target="_blank">平方</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/908/" title="平方根" class="c1" target="_blank">平方根</a> D0.4的算术平方根是0.02

典例分析

例:已知△ABC的三边分别为abcab满足 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/61/" title="平方" class="c1" target="_blank">平方</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/908/" title="平方根" class="c1" target="_blank">平方根</a> ,求c的取值范围

分析:根据非负数的性质求ab的值,再由三角形三边关系确定c的范围

解:因为 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/61/" title="平方" class="c1" target="_blank">平方</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/908/" title="平方根" class="c1" target="_blank">平方根</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/61/" title="平方" class="c1" target="_blank">平方</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/908/" title="平方根" class="c1" target="_blank">平方根</a>0  <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/61/" title="平方" class="c1" target="_blank">平方</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/908/" title="平方根" class="c1" target="_blank">平方根</a> ≥0,所以 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/61/" title="平方" class="c1" target="_blank">平方</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/908/" title="平方根" class="c1" target="_blank">平方根</a> =0  <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/61/" title="平方" class="c1" target="_blank">平方</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/908/" title="平方根" class="c1" target="_blank">平方根</a> =0

所以a=3 b=4 又因为b-a<c<a+b 所以 1<c<7

课下作业

拓展提高

一、选择

1、若 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/61/" title="平方" class="c1" target="_blank">平方</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/908/" title="平方根" class="c1" target="_blank">平方根</a> ,则 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/61/" title="平方" class="c1" target="_blank">平方</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/908/" title="平方根" class="c1" target="_blank">平方根</a> 的平方根为( )

A16 B <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/61/" title="平方" class="c1" target="_blank">平方</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/908/" title="平方根" class="c1" target="_blank">平方根</a> C <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/61/" title="平方" class="c1" target="_blank">平方</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/908/" title="平方根" class="c1" target="_blank">平方根</a> D <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/61/" title="平方" class="c1" target="_blank">平方</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/908/" title="平方根" class="c1" target="_blank">平方根</a>

2 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/61/" title="平方" class="c1" target="_blank">平方</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/908/" title="平方根" class="c1" target="_blank">平方根</a> 的算术平方根是( )

A4 B <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/61/" title="平方" class="c1" target="_blank">平方</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/908/" title="平方根" class="c1" target="_blank">平方根</a> C2 D <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/61/" title="平方" class="c1" target="_blank">平方</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/908/" title="平方根" class="c1" target="_blank">平方根</a>

二、填空

3、如果一个数的算术平方根等于它的平方根,那么这个数是

4、若 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/61/" title="平方" class="c1" target="_blank">平方</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/908/" title="平方根" class="c1" target="_blank">平方根</a> + <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/61/" title="平方" class="c1" target="_blank">平方</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/908/" title="平方根" class="c1" target="_blank">平方根</a> =0,则 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/61/" title="平方" class="c1" target="_blank">平方</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/908/" title="平方根" class="c1" target="_blank">平方根</a> =

三、解答题

5、若a <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/61/" title="平方" class="c1" target="_blank">平方</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/908/" title="平方根" class="c1" target="_blank">平方根</a> 的平方根,b <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/61/" title="平方" class="c1" target="_blank">平方</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/908/" title="平方根" class="c1" target="_blank">平方根</a> 的算术平方根,求 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/61/" title="平方" class="c1" target="_blank">平方</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/908/" title="平方根" class="c1" target="_blank">平方根</a> +2b的值

6、已知a <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/61/" title="平方" class="c1" target="_blank">平方</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/908/" title="平方根" class="c1" target="_blank">平方根</a> 的整数部分,b-1400的算术平方根,求 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/61/" title="平方" class="c1" target="_blank">平方</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/908/" title="平方根" class="c1" target="_blank">平方根</a> 的值


体验中考

1(2009年山东潍坊)一个自然数的算术平方根为 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/61/" title="平方" class="c1" target="_blank">平方</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/908/" title="平方根" class="c1" target="_blank">平方根</a> ,则和这个自然数相邻的下一个自然数是( )

A <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/61/" title="平方" class="c1" target="_blank">平方</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/908/" title="平方根" class="c1" target="_blank">平方根</a> B <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/61/" title="平方" class="c1" target="_blank">平方</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/908/" title="平方根" class="c1" target="_blank">平方根</a> C <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/61/" title="平方" class="c1" target="_blank">平方</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/908/" title="平方根" class="c1" target="_blank">平方根</a> D <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/61/" title="平方" class="c1" target="_blank">平方</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/908/" title="平方根" class="c1" target="_blank">平方根</a>

2、(08年泰安市) <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/61/" title="平方" class="c1" target="_blank">平方</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/908/" title="平方根" class="c1" target="_blank">平方根</a> 的整数部分是 ;若a< <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/61/" title="平方" class="c1" target="_blank">平方</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/908/" title="平方根" class="c1" target="_blank">平方根</a> <b,(ab为连续整数),则a=

b=

3 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/61/" title="平方" class="c1" target="_blank">平方</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/908/" title="平方根" class="c1" target="_blank">平方根</a> 、(08年广州)如图,实数 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/61/" title="平方" class="c1" target="_blank">平方</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/908/" title="平方根" class="c1" target="_blank">平方根</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/61/" title="平方" class="c1" target="_blank">平方</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/908/" title="平方根" class="c1" target="_blank">平方根</a> 在数轴上的位置,

化简  <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/61/" title="平方" class="c1" target="_blank">平方</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/908/" title="平方根" class="c1" target="_blank">平方根</a> =

4、(08年随州)小明家装修用了大小相同的正方形瓷砖共66块铺成10.562的房间,小明想知道每块瓷砖的规格,请你帮助算一算.



















参考答案:

随堂检测:

1 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/61/" title="平方" class="c1" target="_blank">平方</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/908/" title="平方根" class="c1" target="_blank">平方根</a>3

2 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/61/" title="平方" class="c1" target="_blank">平方</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/908/" title="平方根" class="c1" target="_blank">平方根</a>

3x≥-2,≥

4D

拓展提高:

1C

2D

30

416

5、由题意知: <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/61/" title="平方" class="c1" target="_blank">平方</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/908/" title="平方根" class="c1" target="_blank">平方根</a> = <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/61/" title="平方" class="c1" target="_blank">平方</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/908/" title="平方根" class="c1" target="_blank">平方根</a> = 4 b=2 所以 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/61/" title="平方" class="c1" target="_blank">平方</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/908/" title="平方根" class="c1" target="_blank">平方根</a> +2b= 4+4=8

6、解:因为a <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/61/" title="平方" class="c1" target="_blank">平方</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/908/" title="平方根" class="c1" target="_blank">平方根</a> 的整数部分且13< <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/61/" title="平方" class="c1" target="_blank">平方</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/908/" title="平方根" class="c1" target="_blank">平方根</a> <14,所以a=13,又因为b-1400的算术平方根,所以b-1=20 b=21 所以 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/61/" title="平方" class="c1" target="_blank">平方</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/908/" title="平方根" class="c1" target="_blank">平方根</a> = <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/61/" title="平方" class="c1" target="_blank">平方</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/908/" title="平方根" class="c1" target="_blank">平方根</a>

体验中考:

1B

2978

3-2b

4、解:由题意得,每个正方形瓷砖的边长为 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/55/" title="数学" class="c1" target="_blank">数学</a> <a href="/tags/61/" title="平方" class="c1" target="_blank">平方</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/908/" title="平方根" class="c1" target="_blank">平方根</a> ,所以每块瓷砖的边长为0.4.






3