当前位置:首页 > 八年级 > 数学试卷

【329471】1.3整数指数幂

时间:2025-01-21 13:13:09 作者: 字数:8301字
简介:

 <a href="/tags/191/" title="整数" class="c1" target="_blank">整数</a> <a href="/tags/902/" title="指数" class="c1" target="_blank">指数</a>

1.3整数指数幂同步检测

一、选择题

1. 计算(﹣10的结果为(  )

A. 1                                        B. -1                                        

C. 0                                        D. 无意义

2.3x=153y=5,则3x﹣y等于(   )

A. 3                                          B. 5                                        C. 10                                         D. 12

3.3﹣2等于(  )

  1.  9                             B. ﹣  <a href="/tags/191/" title="整数" class="c1" target="_blank">整数</a> <a href="/tags/902/" title="指数" class="c1" target="_blank">指数</a>                                 

C.  <a href="/tags/191/" title="整数" class="c1" target="_blank">整数</a> <a href="/tags/902/" title="指数" class="c1" target="_blank">指数</a>                           D. ﹣9

4.π﹣3.140的相反数是(  ).

A. 3.14﹣π              B. 0             

C. 1                     D. ﹣1

5.通讯卫星的高度是3.6×107米,电磁波在空中的传播速度是3×108/秒,从地面发射的电磁波被通讯卫星接受并同时反射给地面需要(  )

A. 3.6×10-1秒                      B. 1.2×10-1秒                      

C. 2.4×10-2秒                      D.  2.4×10-1秒  

6.下列计算中正确的是(  )

A. a3+a3=a6                       B. a3•a3=a6                      

C. a3÷a3=0                      D. a33=a6

7.计算20140的结果是(  ).

A. 1                                        B. 0                                        

C. 2014                                       D. ﹣1

8.下列算式,计算正确的有(    )
①1030.0001 ②(0.0001)01 ③ <a href="/tags/191/" title="整数" class="c1" target="_blank">整数</a> <a href="/tags/902/" title="指数" class="c1" target="_blank">指数</a>  ④(x)3÷(x)5 <a href="/tags/191/" title="整数" class="c1" target="_blank">整数</a> <a href="/tags/902/" title="指数" class="c1" target="_blank">指数</a>

A. 1个                            B. 2个                                       

C. 3个                            D. 4

9. <a href="/tags/191/" title="整数" class="c1" target="_blank">整数</a> <a href="/tags/902/" title="指数" class="c1" target="_blank">指数</a>

A.  <a href="/tags/191/" title="整数" class="c1" target="_blank">整数</a> <a href="/tags/902/" title="指数" class="c1" target="_blank">指数</a>                             B. 1                                         

C.  <a href="/tags/191/" title="整数" class="c1" target="_blank">整数</a> <a href="/tags/902/" title="指数" class="c1" target="_blank">指数</a>                            D. -1

10.下列计算中,正确的是(  ).

A. 3﹣2=  <a href="/tags/191/" title="整数" class="c1" target="_blank">整数</a> <a href="/tags/902/" title="指数" class="c1" target="_blank">指数</a>                  B.  <a href="/tags/191/" title="整数" class="c1" target="_blank">整数</a> <a href="/tags/902/" title="指数" class="c1" target="_blank">指数</a> =﹣3                 

C. m6÷m2=m3                 D. a﹣b2=a2﹣b2

二、填空题

11.计算:(a﹣1b23=________

12.2015﹣π0+(﹣  <a href="/tags/191/" title="整数" class="c1" target="_blank">整数</a> <a href="/tags/902/" title="指数" class="c1" target="_blank">指数</a> 2=________

13.计算:  <a href="/tags/191/" title="整数" class="c1" target="_blank">整数</a> <a href="/tags/902/" title="指数" class="c1" target="_blank">指数</a> =________

14.(﹣22=________

15.计算:a﹣2÷a﹣5=________

16.已知10m=310n=2,则102m﹣n的值为________ 

17.要使得(x+30+x﹣22有意义,x的取值应满足的条件是________

18.20150=________

三、解答题

19.计算:(﹣22﹣20070+|﹣6|




20.计算:  <a href="/tags/191/" title="整数" class="c1" target="_blank">整数</a> <a href="/tags/902/" title="指数" class="c1" target="_blank">指数</a>




21.我们常用“水滴石穿”来说明一个人只要持之以恒地做某件事,就一定能成功.经测算,当水滴不断地滴在一块石头上时,经过10石头上可形成一个深为1厘米的小洞,那么平均每个月小洞的深度增加多少米?(结果保留三个有效数字,并用科学记数法表示)





22.要使(  <a href="/tags/191/" title="整数" class="c1" target="_blank">整数</a> <a href="/tags/902/" title="指数" class="c1" target="_blank">指数</a> )0有意义,x满足条件是什么?


参考答案

一、选择题

1.A 2.A 3.C 4.C 5.D 6.B 7.A 8.A 9.B 10.A

二、填空题

11. <a href="/tags/191/" title="整数" class="c1" target="_blank">整数</a> <a href="/tags/902/" title="指数" class="c1" target="_blank">指数</a> 12.10 13. <a href="/tags/191/" title="整数" class="c1" target="_blank">整数</a> <a href="/tags/902/" title="指数" class="c1" target="_blank">指数</a> 14. <a href="/tags/191/" title="整数" class="c1" target="_blank">整数</a> <a href="/tags/902/" title="指数" class="c1" target="_blank">指数</a> 15.a3 16. <a href="/tags/191/" title="整数" class="c1" target="_blank">整数</a> <a href="/tags/902/" title="指数" class="c1" target="_blank">指数</a> 17.x≠﹣3x≠2 18.1

三、解答题

19.解:原式=4﹣1+6
                 =9

20.解:原式=1+  <a href="/tags/191/" title="整数" class="c1" target="_blank">整数</a> <a href="/tags/902/" title="指数" class="c1" target="_blank">指数</a>  
                 =1+4
                 =5

21.解:因为10=120个月,1厘米=10-2米,所以平均每个月小洞的深度增加10-2÷120=(1÷120)×10-2≈0.00833×10-2=8.33×10-3×10-2=8.33×10-5().

22.解:要使式子有意义,分母不为0,分子为0.∴x-2≠0,x2-4=0.∴x=-2.