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北師大版八級(jí)上《第章實(shí)數(shù)》單元測(cè)試(三)含答案解析-文庫(kù)吧

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【正文】 給的運(yùn)算法則,分別計(jì)算出2?2和(﹣3)?2的值,然后求解即可.【解答】解:2?2=2﹣2=,(﹣3)?2=(﹣3)﹣2=,則[2?2][(﹣3)?2]==.故答案為:.【點(diǎn)評(píng)】本題考查了實(shí)數(shù)的運(yùn)算,解答本題的關(guān)鍵是讀懂題意,根據(jù)題目所給的運(yùn)算法則求解. 二、解答題(共26小題)5.計(jì)算:.【考點(diǎn)】實(shí)數(shù)的運(yùn)算;零指數(shù)冪;負(fù)整數(shù)指數(shù)冪;特殊角的三角函數(shù)值.【專題】計(jì)算題.【分析】本題涉及零指數(shù)冪、負(fù)指數(shù)冪、特殊角的三角函數(shù)值、絕對(duì)值等考點(diǎn).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=3+﹣2﹣1+=3+1﹣2﹣1+3=4.【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(jiàn)的計(jì)算題型.解決此類題目的關(guān)鍵是熟記特殊角的三角函數(shù)值,熟練掌握零指數(shù)冪、負(fù)指數(shù)冪、特殊角的三角函數(shù)值、絕對(duì)值等考點(diǎn)的運(yùn)算. 6.計(jì)算:sin60176。+|﹣5|﹣(4015﹣π)0+(﹣1)2013+()﹣1.【考點(diǎn)】實(shí)數(shù)的運(yùn)算;零指數(shù)冪;負(fù)整數(shù)指數(shù)冪;特殊角的三角函數(shù)值.【專題】計(jì)算題.【分析】分別進(jìn)行絕對(duì)值、零指數(shù)冪、負(fù)整數(shù)指數(shù)冪的運(yùn)算,然后代入特殊角的三角函數(shù)值,繼而合并可得出答案.【解答】解:原式=+5﹣﹣1+=.【點(diǎn)評(píng)】本題考查了實(shí)數(shù)的運(yùn)算,涉及了絕對(duì)值、零指數(shù)冪、負(fù)整數(shù)指數(shù)冪,掌握各部分的運(yùn)算法則是關(guān)鍵. 7.計(jì)算:.【考點(diǎn)】實(shí)數(shù)的運(yùn)算.【專題】計(jì)算題.【分析】本題涉及絕對(duì)值、乘方、二次根式化簡(jiǎn)等考點(diǎn).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=4﹣1+3=6.【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(jiàn)的計(jì)算題型.解決此類題目的關(guān)鍵是掌握絕對(duì)值、乘方二次根式化簡(jiǎn)等考點(diǎn)的運(yùn)算. 8.計(jì)算:﹣()﹣1+(﹣1)2013.【考點(diǎn)】實(shí)數(shù)的運(yùn)算;負(fù)整數(shù)指數(shù)冪.【專題】計(jì)算題.【分析】本題涉及負(fù)指數(shù)冪、乘方、二次根式化簡(jiǎn)等考點(diǎn).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=4﹣﹣1=4﹣2﹣1=1.【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(jiàn)的計(jì)算題型.解決此類題目的關(guān)鍵是掌握負(fù)指數(shù)冪、乘方、二次根式化簡(jiǎn)等考點(diǎn)的運(yùn)算. 9.計(jì)算:﹣++(π﹣3)0.【考點(diǎn)】實(shí)數(shù)的運(yùn)算;零指數(shù)冪;負(fù)整數(shù)指數(shù)冪.【專題】計(jì)算題.【分析】本題涉及零指數(shù)冪、負(fù)指數(shù)冪、立方根、二次根式化簡(jiǎn)四個(gè)考點(diǎn).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=﹣2++1=1.【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(jiàn)的計(jì)算題型.解決此類題目的關(guān)鍵是掌握零指數(shù)冪、負(fù)指數(shù)冪、立方根、二次根式化簡(jiǎn)等考點(diǎn)的運(yùn)算. 10.計(jì)算:|﹣|+﹣4sin45176。﹣.【考點(diǎn)】實(shí)數(shù)的運(yùn)算;零指數(shù)冪;負(fù)整數(shù)指數(shù)冪;特殊角的三角函數(shù)值.【專題】計(jì)算題.【分析】本題涉及絕對(duì)值、負(fù)指數(shù)冪、特殊角的三角函數(shù)值、0指數(shù)冪等考點(diǎn).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=|﹣2|+﹣4﹣1=2+3﹣2﹣1=2.【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(jiàn)的計(jì)算題型.解決此類題目的關(guān)鍵是熟記特殊角的三角函數(shù)值,熟練掌握絕對(duì)值、負(fù)指數(shù)冪、特殊角的三角函數(shù)值、0指數(shù)冪等考點(diǎn)的運(yùn)算. 11.計(jì)算
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