Question

（2005•長(zhǎng)沙）計(jì)算：（1-2）-2^-1+|-3|．

Answer 1

【答案】分析：本題涉及零指數(shù)冪、負(fù)整數(shù)指數(shù)冪、絕對(duì)值三個(gè)考點(diǎn)．在計(jì)算時(shí)，需要針對(duì)每個(gè)考點(diǎn)分別進(jìn)行計(jì)算，然后根據(jù)實(shí)數(shù)的運(yùn)算法則求得計(jì)算結(jié)果．
解答：解：原式=1-+3=3．
點(diǎn)評(píng)：解決此類題目的關(guān)鍵是熟練掌握負(fù)整數(shù)指數(shù)冪、零指數(shù)冪、絕對(duì)值等考點(diǎn)的運(yùn)算．