(1)解方程:(x-1)3=27 (2)计算:
计算:
(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.