Question

請(qǐng)你談?wù)剬?duì)絕對(duì)值的認(rèn)識(shí)．

Answer 1

解：絕對(duì)值的幾何意義是：數(shù)軸上某個(gè)數(shù)與原點(diǎn)的距離叫做這個(gè)數(shù)的絕對(duì)值；代數(shù)意義是：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．
 絕對(duì)值的性質(zhì)：①互為相反數(shù)的兩個(gè)數(shù)絕對(duì)值相等；②絕對(duì)值等于一個(gè)正數(shù)的數(shù)有兩個(gè)，絕對(duì)值等于0的數(shù)有一個(gè)，沒有絕對(duì)值等于負(fù)數(shù)的數(shù)．③有理數(shù)的絕對(duì)值都是非負(fù)數(shù)．
分析：根據(jù)絕對(duì)值的定義與性質(zhì)作答．
點(diǎn)評(píng)：本題考查了絕對(duì)值的定義與性質(zhì)，是基礎(chǔ)題，比較簡(jiǎn)單．本題答案不唯一．