分析:根據(jù)相反數(shù)的性質(zhì),互為相反數(shù)的兩個(gè)數(shù)和為0;倒數(shù)的性質(zhì),互為倒數(shù)的兩個(gè)數(shù)積為1;絕對(duì)值的定義,一個(gè)正數(shù)的絕對(duì)值是它本身,一個(gè)負(fù)數(shù)的絕對(duì)值是它的相反數(shù),0的絕對(duì)值是0.求解即可.
解答:解:
-2與 2
互為相反數(shù),
-的絕對(duì)值是
,-1
的倒數(shù)是-
.
故答案為:2
,
,-
.
點(diǎn)評(píng):此題主要考查絕對(duì)值的性質(zhì),以及相反數(shù)、倒數(shù)的概念.相反數(shù):符號(hào)不同,絕對(duì)值相等的兩個(gè)數(shù)互為相反數(shù);
倒數(shù):兩個(gè)乘積為1的數(shù)互為倒數(shù),0沒有倒數(shù);
絕對(duì)值規(guī)律總結(jié):一個(gè)正數(shù)的絕對(duì)值是它本身;一個(gè)負(fù)數(shù)的絕對(duì)值是它的相反數(shù);0的絕對(duì)值是0.