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,一元一次不等式組的整數(shù)解,特殊角的三角函數(shù)值
專(zhuān)題:
分析:(1)先分別根據(jù)0指數(shù)冪及負(fù)整數(shù)指數(shù)冪的計(jì)算法則、特殊角的三角函數(shù)值及絕對(duì)值的性質(zhì)計(jì)算出各數(shù),再根據(jù)實(shí)數(shù)混合運(yùn)算的法則進(jìn)行計(jì)算即可;
(2)分別求出各不等式的解集,再求出其公共解集,找出符合條件的x的整數(shù)解即可.
解答:解:(1)原式=9-16÷8+1-2
×
=9-2+1-3
=5;
(2)
,由①得,x≥-1,由②得,x<3,
故此不等式組的解集為:-1≤x<3,
不等式組的整數(shù)解為:-1,0,1,2.
點(diǎn)評(píng):本題考查的是實(shí)數(shù)的運(yùn)算,熟知0指數(shù)冪及負(fù)整數(shù)指數(shù)冪的計(jì)算法則、特殊角的三角函數(shù)值及絕對(duì)值的性質(zhì)是解答此題的關(guān)鍵.