Question

（2006•北京）計(jì)算：．

Answer 1

【答案】分析：注意：=2；負(fù)數(shù)的絕對(duì)值是它的相反數(shù)；任何不等于0的數(shù)的0次冪都等于1；一個(gè)數(shù)的負(fù)指數(shù)等于這個(gè)數(shù)的正指數(shù)次冪的倒數(shù)．
解答：解：
=
=．
點(diǎn)評(píng)：此題考查了二次根式的化簡(jiǎn)、絕對(duì)值的概念、0次冪和負(fù)指數(shù)次冪的性質(zhì)．