Question

絕對(duì)值不大于2的整數(shù)有        個(gè)．

Answer 1

5

試題分析：當(dāng)|x|≤2時(shí)，x的值有±2，±1，0，也可先寫(xiě)出絕對(duì)值不大于2的正整數(shù)，再寫(xiě)出0，和負(fù)整數(shù)的值．由絕對(duì)值的性質(zhì)得，絕對(duì)值不大于2的整數(shù)有±2，±1，0．共有5個(gè)．
點(diǎn)評(píng)：主要要求熟練掌握絕對(duì)值的定義及其應(yīng)用．易錯(cuò)點(diǎn)是漏掉負(fù)整數(shù)值和0，題意理解不清，導(dǎo)致錯(cuò)誤．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．