计算:
计算: (1)()-1-3tan60°+; (2)(a+2)(a-2)-(a-1)2.
计算: (1) (2)
计算(每小题6分,满分12分) (1) (2)
(共计8分)计算: (1)+(﹣2013)0﹣()﹣1+|﹣3| (2)÷﹣×+.
()-3-22×0.25-+(