Question

若實(shí)數(shù)a的絕對(duì)值是3，則實(shí)數(shù)a等于（ ）
A．-3
B．±3
C．
D．

Answer 1

【答案】分析：根據(jù)絕對(duì)值的性質(zhì)解答．
解答：解：∵|±3|=3，
∴a=±3．
故選B．
點(diǎn)評(píng)：本題考查了絕對(duì)值的性質(zhì)，主要利用了互為相反數(shù)的兩個(gè)數(shù)的絕對(duì)值相等．