(1)计算: − ( 2 − 3 ) − ( π − 3 . 14 ) 0 + ( 1 − cos 30 ° ) × ( 1 2 ) − 2 ;
(2)先化简,再求值: 1 a + 1 − a + 1 a 2 − 2 a + 1 ÷ a + 1 a − 1 ,其中 a = 2 .
(11·西宁)(本小题满分7分)计算:.
计算: 12 - - 1 2 - 1 - tan 60 ° + - 8 3 + 3 - 2
计算: ( - 3 ) - 3 + ( - 2011 ) 0 - | ( - 2 ) 3 |
(11·西宁)(本小题满分7分)计算:()-3+(-2011)0-|(-2)3|.
(本题5分)(湖南湘西,17,5分)计算: