计算:
(1) 3 2 - 9 - | - 2 | × 2 - 1
(2) ( a + 1 ) 2 + 2 ( 1 - a )
(1)计算:|﹣|+(2014﹣)0﹣3tan30°; (2).先化简,再求值:,其中是2x2-2x-7=0的根.
(1)计算:;(2)化简:
计算: .
解不等式组.