Question

絕對(duì)值是本身的數(shù)是________
相反數(shù)是本身的數(shù)是________
倒數(shù)是本身的數(shù)是________

Answer 1

非負(fù)數(shù)    0    ±1
相反數(shù)的定義：只有符號(hào)不同的兩個(gè)數(shù)叫互為相反數(shù)，0的相反數(shù)是0；倒數(shù)的定義：乘積是1的兩個(gè)數(shù)叫互為倒數(shù)；絕對(duì)值的意義：正數(shù)的絕對(duì)值是它本身，負(fù)數(shù)的絕對(duì)值是它的相反數(shù)，0的絕對(duì)值是0．
根據(jù)絕對(duì)值的意義，得絕對(duì)值是它本身的數(shù)是非負(fù)數(shù)．
根據(jù)相反數(shù)的定義，得相反數(shù)等于本身的數(shù)是0；
根據(jù)倒數(shù)的定義，得倒數(shù)等于本身的數(shù)是±1；