下面各题,怎样算简便就怎样算. 6.8+0.98+0.2 43.5+43.5×99 1.25×7.2 11÷[(0.4+0.04)×0.5].
口算 0.1×9.02= 1.6×3= 1.2×0.6= 100÷200= 6.2×0.3= 0.7+7.32= 0.6×07= 2.8÷70= 0.9×0.4= 2.1÷7÷0.1=
求下面各图形的面积
做一做,结果能约分的要约分,是假分数的要化成带分数.=========
计算下面图形面积.
怎样简便怎样算. (1)16﹣5.32﹣4.68 (2)7.29×4.6+4.6×12.71 (3)3.4﹣0.15×2.6 (4)1.25×2.5×3.2 (5)40.4÷(0.5+7.5) (6)[(8.1﹣5.6)×0.9﹣1]×0.4.