解不等式组: x 3 + 2 < x 2 x + 2 ⩾ 3 ( x − 1 )
计算:
(11·十堰)计算:-2-1+︱-1︱.
(11·丹东)(本题8分)计算:
计算: (1) (2)
(8分)计算: