算一算,填一填.
脱式计算,能简算的要简算 19.6﹣26.72+80.4﹣3.28 1.5×(6﹣0.68)÷1.419.4×86+19.4×13+19.4 3.72÷1.3+0.18÷1.3.
计算下面各题,能简算的要简算.1.29+3.7+2.71+6.3 3.75÷[0.3×(1.34﹣0.84)] 7.2×7.2+7.2×2.80.25×0.8×0.125×4 25×10.8×0.04 15.32﹣1.8×5﹣3.46.
递等式计算(能简便的要用简便方法计算).①(1÷0.5+0.5÷1)×3.2 ②0.25×3.7×(3.8+0.2)③52.8÷[18.2﹣(4.24÷0.8﹣0.3)]④0.375×8﹣0.8+7.25×0.8.
递等式计算:2.54+2.84+7.46 2.5×4﹣4.8÷1.63.2÷0.4×(5.38﹣4.13)[11.4﹣(2.8÷0.7﹣2.5×1.2)]÷5.2.
计算:12.5×7.8×0.8 [8.85﹣(1.5+3.75)]÷1.8 4.5﹣3.2+3.6÷1.44 0.91÷0.5÷2.6.