1.5-1

1.在（–5）–（     ）= –7中的括号里应填（      ）

      A.–2         B. 2           C.–12             D.12

2.下列说法中错误的有（      ）

①若两数的差是正数，则这两个数都是正数

②若两个数是互为相反数，则它们的差为零

③零减去任何一个有理数，其差是该数的相反数

      A. 0个            B. 1个         C. 2个          D. 3个

3.下列说法中正确的是（    ）

 A. 两数之差一定小于被减数            B. 减去一个负数，差一定大于被减数

 C. 减去一个正数，差不一定小于被减数　  D.零减去任何数，差都是负数

4.下列计算中正确的是（    ）

 A.（—3）－（—3）= —6        B. 0－（—5）=5

C.（—10）－（＋7）= —3      D. | 6－4 |= —（6－4）

5.两个负数的和为a

它们的差为b，则a与b的大小关系是（      ）

    A. a＞b          B. a=b         C. a＜b       D. a≤b

6.数m和n，满足m为正数，n为负数，则m

m+n的大小关系是（     ）

    A. m＞m–n＞m+n                 B. m+n＞m＞m–n

C.m–n＞m+n＞m                  D. m–n＞m＞m+n

7．填空：　

（1）（—2）＋_____=5；　　 （—5）－_______=2；　　0－（—6）=______.

（2）月球表面的温度中午是101⁰C，半夜是-153^oC，则中午的温度比半夜高____.

（3）已知一个数加—3.6和为—0.36，则这个数为_____________.

（4）0减去a的相反数的差为_______________.

（5）已知| a |=3，| b |=4，且a<b，则a－b的值为_________.

8.计算:

(1)(－3)―(―5)； (2)0－7； （3）7.2―(―4.8)； （4）（–3评

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R0lGODlhEAApAHcAMSH+GlNvZnR3YXJlOiBNaWNyb3NvZnQgT2ZmaWNlACH5BAEAAAAALAMABAAJACIAhAAAAAAAAAgDAAADCAsLDQ0LCgQAAA0LCwsGAwoEAAAAAwgKDQQIDQgDBAoLDQ0ICAAECg0KCAMDCAoEAw0IBAMGCwgIDQAABAECAwECAwECAwECAwECAwECAwECAwECAwVUICAewkCIYmEEJooirQvAp0zLc+zetv76ooRPFQgoFrikcslsuorQqHNKVRIDDNSh4ZhhRQ8kgARJJsoyUlYWkdRcE/Fu7aJURBGLiBK9dBFRAWUhADs=" />）

 

 

 

 

9.2005年4月10日，哈尔滨等5个城市的最高气温与最低气温记录如下表（单位℃） 哪个城市的温差最大？哪个城市的温差最小？

城市名称	哈尔滨	长春	沈阳	北京	大连
最高温度(oC)	2	3	3	10	6
最低温度(oC)	-12	-10	-8	2	-2

 

1.5-2

1.计算3评

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  A.［3评

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  C.［3评

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2.计算(-评

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  A.7   B.-7   C.1   D.-1

3.若三个有理数的和为0，则(  )

  A.三个数可能同号                  B.三个数一定为0

  C.一定有两个数互为相反数          D.一定有一个数等于其余两个数的和的相反数

4.计算(-0.5)+3评

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5.已知a+c=-2 012，b+(-d)=2 013，则a+b+c+(-d)=________.

6.绝对值大于201，而小于2 001的所有整数之和是____________.

7.上周五股民新民买进某公司股票1 000股，每股35元，下表为本周内每日股票的涨跌情况(单位：元)：

星期	一	二	三	四	五
每股涨跌	+4	+4.5	-1	-2.5	-6

  则在星期五收盘时，每股的价格是_______.

8.用适当方法计算：

  (1)0.36+(-7.4)+0.5+(-0.6)+0.14               (2)(-51)+(+12)+(-7)+(-11)+(+36)

 

 

  (3)(-3.45)+(-12.5)+(+19.9)+(+3.45)+(-7.5)       (4)3评

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9.每袋大米的标准重量为50千克，10袋大米称重记录如下：+1.2，-0.4，+1，0，-1.1，-0.5，+0.3，+0.5，-0.6，-0.9(超过记为正，不足记为负).问:

(1)这10袋大米总计超过多少千克或不足多少千克？

(2)10袋大米的总重量是多少千克？

 

 

 

 

10.一天下午要测量一次血压，下表是该病人星期一至星期五血压变化情况，该病人上个星期日的血压为160单位，血压的变化与前一天比较：

星期	一	二	三	四	五
血压的变化	升30单位	降20单位	升17单位	升18单位	降20单位

请算出星期五该病人的血压.