(24分)计算下列各题:(1) . (-3) × (-4) ÷(-6) (2). (3). -1.53×0.75-0.53×() (4).1÷()× (5).―(1―0.5)÷×[2+(-4)2] (6).
计算(每小题3分,共9分) (1) (2)-(x-1)(x-2) (3)用简便方法计算:20142﹣4030×2014+20152
(每小题3分,共6分)计算: (1) (2)
计算或化简 (1) (2)
计算:.
计算: