絕對(duì)值

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);零的絕對(duì)值是零.絕對(duì)值可以看成代表這個(gè)數(shù)的點(diǎn)到原點(diǎn)的距離.實(shí)數(shù)a的絕對(duì)值用ㄧaㄧ表示:注意:相反數(shù)的絕對(duì)值相等.如ㄧaㄧ=ㄧ-aㄧ,ㄧa-bㄧ=ㄧb-aㄧ. ......    （本文共 106 字 ）     [閱讀本文] >>