解下列方程:(1)(2)
(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-;
(2011四川乐山17,3分)计算:
(2011四川凉山州,18,6分)计算: