Question

-1

1

2

的倒數(shù)是

 

；若|-m|=|-7|，則m=

 

．

Answer 1

分析：根據(jù)倒數(shù)和絕對(duì)值的概念．

解答：解：-1

1

2

=-

3

2

的倒數(shù)是-

2

3

；若|-m|=|-7|，則m=±7．

點(diǎn)評(píng)：此題主要考查了倒數(shù)和絕對(duì)值的概念．
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．