当前位置:首页 > 八年级 > 数学试卷

【329572】2.6 实数 课堂练习1

时间:2025-02-02 18:24:30 作者: 字数:2163字


 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/937/" title="课堂" class="c1" target="_blank">课堂</a>

2.6 实数

一、选择题

1.下列说法正确的是( )

A.因为1的平方是1,所以1的平方根是1

B.因为任何数的平方都是正数,所以任何数的平方根都是正数

C36的负的平方根是-6

D.任何数的算术平方根都是正数

2.立方根等于本身的数有( )

A10,-1 B10 C.-11 D0,-1

3.下列各式中错误的是( )

A <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/937/" title="课堂" class="c1" target="_blank">课堂</a> B <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/937/" title="课堂" class="c1" target="_blank">课堂</a>

C <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/937/" title="课堂" class="c1" target="_blank">课堂</a> D <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/937/" title="课堂" class="c1" target="_blank">课堂</a>

4.某数的绝对值和算术平方根都等于它本身,这个数是( )

A1或-1 B10 C.-10 D1,-10

5.-27的立方根与 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/937/" title="课堂" class="c1" target="_blank">课堂</a> 的平方根之和是( )

A0 B6 C0或-6 D.-126

6.下列四个命题中,正确的是( )

A.数轴上任意一点都表示惟一的一个有理数

B.数轴上任意一点都表示惟一的一个无理数

C.两个无理数之和一定是无理数

D.数轴上任意两个点之间还有无数个点

二、填空题

125的算术平方根是__________

2 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/937/" title="课堂" class="c1" target="_blank">课堂</a> 的平方根是___________

3 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/937/" title="课堂" class="c1" target="_blank">课堂</a> 的立方根是__________

4.如果 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/937/" title="课堂" class="c1" target="_blank">课堂</a> ,那么a的取值范围是_________

5.绝对值最小的实数是__________

6.在数轴上位于 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/937/" title="课堂" class="c1" target="_blank">课堂</a> 左边 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/937/" title="课堂" class="c1" target="_blank">课堂</a> 个单位的点所表示的实数是___________

三、解答题

1.比较下列各组数的大小:

1 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/937/" title="课堂" class="c1" target="_blank">课堂</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/937/" title="课堂" class="c1" target="_blank">课堂</a>

2 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/937/" title="课堂" class="c1" target="_blank">课堂</a> 和-3.1416

3 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/937/" title="课堂" class="c1" target="_blank">课堂</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/937/" title="课堂" class="c1" target="_blank">课堂</a>

4 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/937/" title="课堂" class="c1" target="_blank">课堂</a> <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/937/" title="课堂" class="c1" target="_blank">课堂</a>

2.求下列各数的绝对值:

1 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/937/" title="课堂" class="c1" target="_blank">课堂</a> ,(2 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/937/" title="课堂" class="c1" target="_blank">课堂</a> ,(3 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/937/" title="课堂" class="c1" target="_blank">课堂</a>

4 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/937/" title="课堂" class="c1" target="_blank">课堂</a> ,(5 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/937/" title="课堂" class="c1" target="_blank">课堂</a> ,(6 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/937/" title="课堂" class="c1" target="_blank">课堂</a>

3.用“<”号把下列各组数连接起来:

1)-0.2 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/937/" title="课堂" class="c1" target="_blank">课堂</a>3.14 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/937/" title="课堂" class="c1" target="_blank">课堂</a>

2 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/937/" title="课堂" class="c1" target="_blank">课堂</a>

3 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/937/" title="课堂" class="c1" target="_blank">课堂</a>

4.计算

1 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/937/" title="课堂" class="c1" target="_blank">课堂</a> ,(2 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/937/" title="课堂" class="c1" target="_blank">课堂</a>

3 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/937/" title="课堂" class="c1" target="_blank">课堂</a> ,(4 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/937/" title="课堂" class="c1" target="_blank">课堂</a>

5 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/937/" title="课堂" class="c1" target="_blank">课堂</a>

6 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/937/" title="课堂" class="c1" target="_blank">课堂</a>






















参考答案

一、选择题

1C 2A 3B 4B 5C 6D

二、填空题

15 2 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/937/" title="课堂" class="c1" target="_blank">课堂</a> 3 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/937/" title="课堂" class="c1" target="_blank">课堂</a> 4 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/937/" title="课堂" class="c1" target="_blank">课堂</a> 50 6 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/937/" title="课堂" class="c1" target="_blank">课堂</a>

三、解答题

1.(1)> (2)> (3)> (4)>

2.(1 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/937/" title="课堂" class="c1" target="_blank">课堂</a>2 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/937/" title="课堂" class="c1" target="_blank">课堂</a>3 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/937/" title="课堂" class="c1" target="_blank">课堂</a>4 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/937/" title="课堂" class="c1" target="_blank">课堂</a>5 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/937/" title="课堂" class="c1" target="_blank">课堂</a>6 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/937/" title="课堂" class="c1" target="_blank">课堂</a>

3.(1 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/937/" title="课堂" class="c1" target="_blank">课堂</a>

2 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/937/" title="课堂" class="c1" target="_blank">课堂</a>

3 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/937/" title="课堂" class="c1" target="_blank">课堂</a>

4.(1 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/937/" title="课堂" class="c1" target="_blank">课堂</a>2 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/937/" title="课堂" class="c1" target="_blank">课堂</a>3 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/937/" title="课堂" class="c1" target="_blank">课堂</a>

4 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/937/" title="课堂" class="c1" target="_blank">课堂</a>5 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/937/" title="课堂" class="c1" target="_blank">课堂</a>6 <a href="/tags/48/" title="练习" class="c1" target="_blank">练习</a> <a href="/tags/842/" title="实数" class="c1" target="_blank">实数</a> <a href="/tags/937/" title="课堂" class="c1" target="_blank">课堂</a>