(2011广东湛江21,6分)计算:
(2011广东中山,11,6分)计算:
(2011重庆市潼南,17,6分)计算: +|-2|++(-1)2011.
(2011内蒙古乌兰察布,20,7分) 计算:
(20011江苏镇江,18,4分)计算:sin45°;
(2011山东东营,18,3分)计算: