(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:
(2011江苏盐城,19(1),4分)计算:( )0 - ( )-2 + tan45°;
(2011湖南永州,17,6分)计算:
(2011广东肇庆,16,6分)计算: