Question

4．若|a|=|-$\frac{1}{2}$|，則a=$±\frac{1}{2}$．

Answer 1

分析 先化簡(jiǎn)|$-\frac{1}{2}$|，再根據(jù)絕對(duì)值的意義，確定a的值．

解答 解：因?yàn)閨-$\frac{1}{2}$|=$\frac{1}{2}$，|$±\frac{1}{2}$|=$\frac{1}{2}$，
當(dāng)|a|=|-$\frac{1}{2}$|時(shí)，a=$±\frac{1}{2}$
故答案為：$±\frac{1}{2}$

點(diǎn)評(píng) 本題考查了絕對(duì)值的意義．正數(shù)和0的絕對(duì)值是它本身，負(fù)數(shù)的絕對(duì)值的它的相反數(shù)．互為相反數(shù)的兩個(gè)數(shù)的絕對(duì)值相等．