Question

（2009•賀州）計(jì)算：|-2009|=    ．

Answer 1

【答案】分析：根據(jù)絕對(duì)值定義去掉這個(gè)絕對(duì)值的符號(hào)，一個(gè)負(fù)數(shù)的絕對(duì)值是它的相反數(shù)．
解答：解：∵-2009＜0，∴|-2009|=2009．
點(diǎn)評(píng)：解答此題的關(guān)鍵是熟知絕對(duì)值的性質(zhì)：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．