题型突破卷3计算题(一)专项1：口算1.凑整。25×0.4＝12.5×0.8＝1÷0.04＝100÷1.25＝2.4×5＝0.4×0.5＝1.25×1.6＝500÷0.25＝2.5×0.7×0.4＝60×0.125×8＝2.注意小数点的位置。0.38×10＝4.7×1.1＝7.2÷6＝5.5÷55＝7.5×4＝0.81÷0.9＝3.05×8＝0.72÷0.12＝8.04÷0.4＝2.1×0.8＝3.注意运算顺序。3.6＋6.4×5＝0.4×5÷0.4×5＝3.2÷8×0.5＝20×0.5＋12＝0.62＋0.38×0＝7.6－0.6÷2＝0.75÷0.5×8＝6.2÷6.2×6.2÷2＝专项2：竖式计算4.小数乘法。7.9×3.86.4×5.090.85×0.24320×8.55.小数除法，带*的要验算。25.6÷465÷2642.02÷55*0.57÷3.880÷0.25*0.21÷0.0126.乘、除法中的近似数。(1)得数保留两位小数。4.6×0.573.78×2.32(2)得数保留三位小数。2.72×0.0264.35×0.016(3)得数保留一位小数。10.05÷324.035÷24(4)得数保留整数。3.2÷0.2678.53÷43专项3：算式间的大小关系7.乘法。7.9×1.57.90.980.34×0.989.47×0.329.47×3.20.26×10.1×2.68.除法。3.2÷1.13.20.48÷0.50.486.24÷1.46.24÷0.143.84÷138.4÷0.19.乘除混合。4.7×1.54.7÷1.50.35÷0.50.5×0.356.35×0.126.35÷1.20.25÷10.25×1答案1．10102580120.2220000.7602．3.85.171.20.1300.924.4620.11.683．35.6250.2220.627.3123.14．30.0232.5760.20427205．6.42.50.7640.15(验算略)32017.5(验算略)6．(1)2.628.77(2)0.0710.070(3)0.30.2(4)1227．＞＞＜＝8．＜＞＜＜9．＞＞＜＝
