2018七年级数学上册第2章有理数及其运算2.8有理数的除法知能演练提升(新版)北师大版.docx

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1、18 有理数的除法知能演练提升一、能力提升1.(2017黑龙江哈尔滨双城区校级月考)已知整数 a,b 满足 ab=-6,则 的值有( ).abA.1 个 B.2 个 C.3 个 D.4 个2.(2017甘肃陇南宕昌县期中)下列运算错误的是( ).A. (-3)=3(-3)13B.-5 =-5(-2)(-12)C.8-(-2)=8+2D.03=03.下列各式的值等于 9 的是( ).A. B. C. D.+63-7 -637 -63-(-7) |-63-7|4.计算 12-7(-4)+8(-2)的结果是( ).A.-24 B.-20 C.6 D.365.(2017四川巴中南江县校级期中)计算 (

2、ab0)的结果是( ).a|a|+ b|b|A.2 B.0 C.2 或 0 D.26.等式( -7.3)- =0 中,表示的数是 .(-67)7.观察下列一组数据: -3,-6,-12,-24, ,-96,按你发现的规律在横线上填上适当的数 . 8.计算:(1)(-6) ;(-35)(-14)(2)(-0.75) (-0.3);54(3)(-12.5) .(-76)(-14)9.某冷冻厂的一个冷库的温度是 -2 ,现有一批食品需要在 -28 的条件下冷藏,若每小时降温 4 ,则几小时能降到所要求的温度?2二、创新应用10.火车在东西向的铁路上运行,规定自车站向东为正,向西为负,进 A 站以前的

3、时间为负,出 A 站以后的时间为正 .请你以上述信息为背景,编制一个问题,解释算式“( -180)(-3)”的含义 .3知能演练提升一、能力提升1.D 2.A 3.D 4.D 5.C 6.-7.3 7.-488.解 (1)原式 =- =- =-40.(63514) (6534)(2)原式 =0.751.250.3=2.(3)原式 =- =- .(252674) 30079.解 -2-(-28)4= (h),所以 h 能降到所要求的温度 .132 132二、创新应用10.解 如一列火车匀速向 A 站行驶,当火车在离 A 站西侧 180 km 时,火车进 A 站还需 3 h,则火车的速度为( -180)(-3)=60(km/h).

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