(1)解方程: x - 3 x - 2 + 1 = 3 2 - x ;
(2)解不等式组: 2 x > 1 - x 4 x + 2 < x + 4 .
计算: 48º39'+67º31'-21º17'×5;
解不等式组:
计算:
(本题5分)计算:-+2sin60°+
计算:(2+)(2-)