小數(shù)乘除法練習(xí)題及簡便計(jì)算.doc

一、計(jì)算題（30分）1、直接寫出得數(shù)。0.452.5 0.81.25 0.33.6 0.30.3 100.07 0.31.4 0.057 0.920.4 0.20.26 0.144 0.020.1 1.20.30.20.48.21. 10035.22 2.34.50.4 2.45 0.224 3.250 0.90.52 3.991 03.52= 12.548 810 = 10-1.8-7.2= 0.43+3.57= 2.5412=0.90.8= 1.05100= 10.5= 0.963= 1.470.7= 5.46= 0.16.510= 0.56100= 3.78100= 40.8= 3.215100= 0.810= 4.08100= 1.10.2 =0.60.8 = 30.9= 2.50.4= 3.60.4= 12.58= 500.04= 800.3 = 1.19= 0.165 1.782.2 = 9.60.6 = 1.20.5-0.4 = 0.70.01 = 2.50.4 = 123.9= 1.2581.25 = 6.60.66 = 5.370+4.63 = 3.92.03 4.23.5 1.6+2.40.3 = 2.140.92745673= 0.30.3= 7.22.8 0.90.01 120.3= 2.870.7134 0.960.3 1.50.4 70.25 2.50.70.8= 82.5 161.6 5.61.01=8（2.50.25） 0.360.64 64.3216 4.20.1 72.80.8 8.44.2 13.89.92.42.5 0.050.8 2.560.37 1.250.80.5122.5 1.233 3.21.63.53.53 19.62 8.82.2= 0.754（1.50.25）4 0.50.8=8.40.2= 1.60.2 7.20.3= 2.80.3 0.90.15= 1.80.4= 5.50.55= 0.08100= 2.20.11= 5.464.54= 12.50.8= 0.350.3= 1.45= 2.84= 19.64= 22.54=2、用豎式計(jì)算 0.3961.2= 0.7560.36= 15.613=0.1815= 0.02514= 3.0636=0.040.12 3.842.6 5.763 （保留一位小數(shù)）7.1522 90.753.3 3.680.2516.90.13 1.553.9 3.70.01613.760.8= 5.20.6 8.41.3 6.40.5 4.480.4 5.25535.44.2 0.0420.54 0.760.32 0.250.046 2.523.4 1.0825 0.120.50.16 4.80.25 0.1251.4（保留兩位小數(shù)）2.50.7= （保留三位小數(shù)） 10.13.3= （商用循環(huán)小數(shù)）10.7512.5= （用乘法驗(yàn)算） 3.259.04= （用除法驗(yàn)算） 3、脫式計(jì)算（能簡算的要簡算）2.57.14 16.129916.12 5.20.90.97.2899+7.28 4.3500.2 642.640.52615.715.724 (2.275 0.625)0.28 3.94+34.30.2 2.75.43.9 1.2(9.62.4)4.8 8.91.14.7 6.584.50.9 3.69.85-5.46 8.053.4+7.6 2.80.5+1.58 4.84.80.5 324.90.9 (1.250.125)8 56.59956.54.8100.1 7.0910.80.87.09 4.85 + 0.35 1.4 12.50.42.58 0.873.16+4.64 9.5101 0.68 （5.2 -3.5） 1.25 8.7 17.4 - 8.7 7.4 40.5 0.81 0.18 4.8 （15 2.4） 2.13.0.82576.81+6.8199 0.2518540 4.40.83.40.8 (9.37+9.37+9.37+9.37) 25 42.1.254.21.752.376.3+2.373.7 2.51.250.32 3.810.12.5(3.80.04) 7.69101 3.810.1 0.2539+0.25 0.12572 460.33+540.3