Question

-2的倒數(shù)是

-

1

2

，絕對(duì)值等于3的數(shù)是

±3

．

Answer 1

分析：倒數(shù)的定義：若兩個(gè)數(shù)的乘積是1，我們就稱這兩個(gè)數(shù)互為倒數(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．

解答：解：-2的倒數(shù)為-

1

2

，絕對(duì)值為3的數(shù)為±3．
故答案為：-

1

2

，±3．

點(diǎn)評(píng)：本題考查了倒數(shù)的定義，注意絕對(duì)值等于3的數(shù)有兩個(gè)．