(1)÷2= (2)501-199= (3)500÷4= (4)×= (5)1-0.05= (6)3.8+7.2= (7)1÷0.125= (8)+= (9)2.06×12.5×8= (10)×0.4×= (11)-0.375= (12)12×﹙1+)=
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)÷﹣×+.