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1、1、直接写出得数.0.452.50.81.250.33.6 0.30.3 100.07 0.31.4 0.0570.920.40.20.26 0.144 0.020.1 1.20.30.20.4 8.21.8 10035.22 2.342.50.4 2.45 0.224 3.2500.90.52 3.99103.5212.58810 =10-1.8-7.2= 0.43+3.57= 2.5412=0.90.8= 7.5x-3x =a+3a+7a= 1.05100=10.5= 0.963=1.470.7= 5.46=0.16.510=0.56100=3.78100=40.8 =3.215100=0
2、.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 4.23.51.6+2.40.3 = 2.140.9 2745673= 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
3、.6 5.61.01= 8（2.50.25） 0.360.64 64.3216 4.20.172.80.8 8.44.2 13.89.9 2.42.50.050.8 2.560.37 1.250.80.5 122.5 1.233 3.21.6 3.53.53 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、用竖式计算0.39
4、61.2=0.7560.36= 15.613=0.1815= 0.02514= 3.0636=0.040.12 3.842.6 5.763（保留一位小数）7.1522 90.753.33.680.2516.90.13 1.553.9 3.70.01613.760.8= 5.20.68.41.36.40.54.480.4 5.25535.44.2 0.0420.540.760.320.250.0462.523.41.08250.120.50.16 4.80.25 0.1251.4（保留两位小数）2.50.7= （保留三位小数） 10.13.3= （商用循环小数）10.7512.5= （用乘法验算
5、） 3.259.04= （用除法验算）3、脱式计算（能简算的要简算）2.57.1416.129916.125.20.90.97.2899+7.28 4.3500.2 642.640.52615.715.724(2.275 0.625)0.283.94+34.30.2 1.2(9.62.4)4.88.91.14.7 2.75.43.93.69.85-5.468.053.4+7.66.584.50.9 2.80.5+1.58324.90.94.84.80.5(1.250.125)84.8100.1 56.59956.5 7.0910.80.87.094.85 + 0.35 1.48.7 17.4
6、- 8.7 7.412.50.42.58 0.873.16+4.649.51010.68 （5.2 -3.5） 1.2540.5 0.81 0.18 4.8 （15 2.4） 213.0.82576.81+6.8199 0.2518540 4.40.83.40.8(9.37+9.37+9.37+9.37) 2542.1.1.1.752.376.3+2.373.7 2.51.250.32 3.810.12.5(3.80.04) 7.69101 3.810.10.2539+0.25 0.12572 460.33+540.33(85.27) 1.256.81+6.8199 0.25185406.80.750.53.750.1252.75 1.53+23.47.29.599 13.50.98 12.58.8