解:(1)
=1+4-2
=3;
(2)
=1+
-2
=-
;
(3)
=1+3
-2+1-
=2
;
(4)
=2+2+1
=5;
(5)
=1-8+3+2
=-2;
(6)
=1-4+4
=1.
分析:(1)本題涉及零指數(shù)冪、負(fù)整數(shù)指數(shù)冪、乘方三個(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;
(2)本題涉及零指數(shù)冪、負(fù)整數(shù)指數(shù)冪兩個(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;
(3)本題涉及零指數(shù)冪、二次根式化簡、負(fù)整數(shù)指數(shù)冪、絕對(duì)值四個(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;
(4)本題涉及零指數(shù)冪、二次根式化簡、負(fù)整數(shù)指數(shù)冪三個(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;
(5)本題涉及零指數(shù)冪、乘方、負(fù)整數(shù)指數(shù)冪、絕對(duì)值四個(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;
(6)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.
點(diǎn)評(píng):本題考查實(shí)數(shù)的綜合運(yùn)算能力,是各地中考題中常見的計(jì)算題型.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、乘方、絕對(duì)值、二次根式化簡等考點(diǎn)的運(yùn)算.