分析:(1)分別根據(jù)特殊角的三角函數(shù)值、0指數(shù)冪的計(jì)算法則計(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)分別根據(jù)特殊角的三角函數(shù)值、0指數(shù)冪的計(jì)算法則、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;
(3)分別根據(jù)特殊角的三角函數(shù)值、0指數(shù)冪的計(jì)算法則、絕對(duì)值的性質(zhì)及有理數(shù)乘方的法則計(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.
解答:解:(1)原式=
+
×
-1
=
+1-1
=
;
(2)原式=
×(-8)+1+
=-1+1+
=
;
(3)原式=2÷1+2
-2-
×1
=2+2
-2-2
+2
=2.
點(diǎn)評(píng):本題考查的是二次根式的混合運(yùn)算,熟知特殊角的三角函數(shù)值、0指數(shù)冪的計(jì)算法則、絕對(duì)值的性質(zhì)及有理數(shù)乘方的法則是解答此題的關(guān)鍵.