七年级数学上册第二章有理数2.3《相反数与绝对值》相反数同步练习1(新版)青岛版.doc

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1、1相反数同步练习一、随堂检测1、-(+5)表示 的相反数,即-(+5)= ;-(-5)表示 的相反数,即-(-5)= 。2、-2 的相反数是 ;75的相反数是 ;0的相反数是 。3、化简下列各数:-(-68)= -(+0.75)= -(- 5)= -(+3.8)= +(-3)= +(+6)= 4、下列说法中正确的是( )A、正数和负数互为相反数 B、任何一个数的相反数都与它本身不相同C、任何一个数都有它的相反数 D、数轴上原点两旁的两个点表示的数互为相反数二、拓展提高1、-(-3)的相反数是 。2、已知数轴上 A、B 表示的数互为相反数,并且两点间的距离是 6,点 A在点 B的左边,则点 A、

2、B 表示的数分别是 。3、已知 a与 b互为相反数,b 与 c互为相反数,且 c=-6,则 a= 。4、一个数 a的相反数是非负数,那么这个数 a与 0的大小关系是 a 0.5、数轴上 A点表示-3,B、C 两点表示的数互为相反数,且点 B到点 A的距离是 2,则点 C表示的数应该是 。6、下列结论正确的有( )任何数都不等于它的相反数;符号相反的数互为相反数;表示互为相反数的两个数的点到原点的距离相等;若有理数 a,b互为相反数,那么 a+b=0;若有理数 a,b2互为相反数,则它们一定异号。A 、2 个 B、3 个 C、4 个 D、5 个7、如果 a=-a,那么表示 a的点在数轴上的什么位

3、置?三、体验中考1、 (2009 年,河南)-5 的相反数是( )A、 5 B、 51 C、 -5 D、52、 (2009 年,杭州)如果 a+b=0,那么 a,b两个有理数一定是( )A、都等于 0 B、一正一负 C、互为相反数 D、互为倒数(原题是“那么两个实数一定是”此处改为“两个有理数是” )3参考答案一、随堂检测1、5,-5,-5,5;2、2, 7,0;3、68,-0.75, 53,-3.8,-3,6;4、C 考查相反数的代数意义和几何意义二、拓展提高1、-3 2、-3,33、-64、5、1 或 56、A 根据相反数的定义。7、a=-a 表示有理数 a的相反数是它本身,那么这样的有理数只有 0,所以 a=0,表示 a的点在原点处。三、体验中考1、D 2、C

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