(本题满分8分,每题4分)计算:(1)+2sin45°- (2)2(a+1)-(3-a)(3+a)-
. (2011山东滨州,19,6分)计算:
,6分)计算:
(2011 浙江湖州,17,6)计算:
计算:.
,4分)(1)计算:;