简便计算.18×+2 ×﹣. 0.8×7.3﹣63×20.0865.5﹣4.29+24.6﹣5.71 1991+1989+2000+1995+2011+2005+1998+1993.
9.81×0.1+0.5×98.1+0.049×981.
灵活计算下面各题 1.25×0.32×250×2009 ﹣÷﹣86×(﹣)×3.
25×12.5×32.
(1)2012× (2)×78+0.5×1.25﹣730÷80 (3)56÷11×165÷7 (4)(﹣)×28+4×7﹣3×7.
计算下列各题,能简便的要简便计算 (+)×15×17 5.66×7.28﹣3.16×3.16﹣3.16×4.12 2012×0.875+201.2×1.25.