周练三

练习三

一、选择题

1．在﹣2，+3.5，0，，﹣0.7，11中，负分数有（）

A．l个 B．2个C．3个D．4个

2．设x是有理数，那么下列各式中一定表示正数的是（）

A．2008x B．x+2008 C．|2008x|D．|x|+2008

3．马虎同学做了以下5道计算题：①0﹣（﹣1）=1；②÷（﹣）=﹣1；③﹣+=﹣（+）=﹣1；④﹣7﹣2×5=﹣9×5=﹣45；请你帮他检查一下，他一共做对了（）

A．1题B．2题C．3题D．4题

4．下列说法中①相反数等于本身的数是0，②绝对值等于本身的是正数，③倒数等于本身的数是±1，正确的个数为（）

A．3个B．2个C．1个D．0个

5．冬季某天我国三个城市的最高气温分别是﹣10℃，1℃，﹣7℃，它们任意两城市中最大的温差是（）

A．11℃B．17℃C．8℃ D．3℃

6．若|a|=﹣a，则有理数a为（）

A．正数B．负数C．非负数D．负数和零

7．若|x|=3，|y|=4，则x+y的绝对值是（）

A．7或﹣7 B．1或﹣1 C．7或1 D．7，﹣7，1，﹣1

8．如果a+b＞0，且ab＜0，那么（）

A．a＞0，b＞0

B．a＜0，b＜0

C．a、b异号D．a、b异号且负数的绝对值较小

9．a，b是有理数，它们在数轴上的对应点的位置如图所示，把a，﹣a，b，﹣b 按照从小到大的顺序排列（）

A．﹣b＜﹣a＜a＜b B．﹣a＜﹣b＜a＜b C．﹣b＜a＜﹣a＜b D．﹣b＜b＜﹣a＜a 10．正方形ABCD在数轴上的位置如图所示，点D、A对应的数分别为0和1，若正方形ABCD绕着顶点顺时针方向在数轴上连续翻转，翻转1次后，点B所对应的数为2；则翻转2016次后，数轴上数2016所对应的点是（）

A．点C B．点D C．点A D．点B

二、填空题

11．﹣0.5的相反数是，倒数是．

12．一个数的绝对值是4，则这个数是．

13．比﹣1大1的数为．

14．比较大小：

（填“＜”、“=”或“＞”）．

15．如果正午（中午12：00）记作0小时，午后3点钟记作+3小时，那么上午8点钟可表示为．

16．已知是a整数，且﹣3＜a＜4，则表示a的所有整数的积是．

17．利用分配律可以得﹣2×6+3×6=（﹣2+3）×6=﹣6．如果a表示任意一个有理数，那么利用分配律可以得到﹣2a+3a=（）a=．

18．如图所示是计算机某计算程序，若开始输入x=3，则最后输出的结果是．

三、解答题

19．将下列各数在数轴上表示出来，并把它们用“＜”连接起来． ﹣（﹣3），0，﹣|﹣1.25|，，﹣2．

20．计算：

（1）（﹣3）+（﹣4）﹣（+11）﹣（﹣19） （2）﹣10﹣8÷（﹣2）×（﹣）

（3）（﹣）×30÷（﹣） （4）（﹣+﹣）×|﹣12|

（5）18×+13×﹣4×． （6）（﹣36）÷9．

21．已知a=﹣4，b=2，求式子的值．

22．有20筐白菜，以每筐25千克为标准，超过或不足的千克数分别用正、负数来表示，记录如下：

（1）20筐白菜中，最重的一筐比最轻的一筐多重多少千克？ （2）与标准重量比较，20筐白菜总计超过或不足多少千克？

（3）若白菜每千克售价2.6元，则出售这20筐白菜可卖多少元？（结果保留整数）

23

．根据下面给出的数轴，解答下面的问题：

（

1

）请你根据图中

A 、B

两点的位置，分别写出它们所表示的有理数A

：

B ： ；

（2）观察数轴，与点A 的距离为4的点表示的数是： ；

（3）若将数轴折叠，使得A 点与﹣3表示的点重合，则B 点与数 表示的点重合；

（4）若数轴上M 、N 两点之间的距离为2016（M 在N 的左侧），且M 、N 两点

经过（3）中折叠后互相重合，则M 、N 两点表示的数分别是：M ： N ： ．

24．出租车司机小李某天上午营运时是在东西走向的大街上进行的，如果规定向东为正，向西为负，他这天上午所接六位乘客的行车里程（单位：km）如下：﹣2，+5，﹣1，+1，﹣6，﹣2，问：

（1）将最后一位乘客送到目的地时，小李在什么位置？

（2）若汽车耗油量为0.2L/km（升/千米），这天上午小李接送乘客，出租车共耗油多少升？

（3）若出租车起步价为8元，起步里程为3km（包括3km），超过部分每千米1.2元，问小李这天上午共得车费多少元？25．观察下列等式：

第1个等式：a1==（1﹣）

第2个等式：a2==（﹣）

第3个等式：a3==（﹣）

第4个等式：a4==（﹣）

…

请回答下列问题：

（1）按上述等式的规律，列出第5个等式：a5==（2）用含n的式子表示第n个等式：a n==

（3）求a1

+

a2+a3+a4+…+a100的值．

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2019届高三英语周周练三 上海市 英语试卷

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