解方程和不等式组:
(1) 2 x - 5 x - 2 = 3 x - 3 x - 2 - 3 ;
(2) - 2 x ⩽ 6 4 x + 1 < 5 .
(2011四川重庆,17(1),3分)计算:|-3|+(-1)2011×(π-3)0-+()-2
计算:
(2011湖南怀化,17,6分)计算:
计算:|-5|+22-(+1)0
(2011江苏南通,19,5分)计算:22+(-1)4+(-2)0-;