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1、. . 练习（一）4.86= 0.960.03= 2.40.2= 4.80.6= 9.60.3= 25.86= 22.83= 5.980.23= 19.765.2= 3.817= 3242= 246.413= 2.170.7= 0.40.01= 5.3+6.7= 5.4-3.6-1.4= 300.01= 151.5=12.9-8.5= 7.20.4= 2.81.4= 8+2-8+2= 286+198= 314-202= 526+301= 223-99= 0.452.5 0.81.25 0.33.6 0.30.3100.07 0.31.4 0.057 练习（二）2.140.9= 0.5+7.6=
2、 24048= 4200300= 0.750.38= 396+99= 9030= 2035= 10.2= 32.25= 1.57+3.43= 286+199=18.549.9= 3699= 2.42= 480.6= 963= 0.240.2= 4.86= 0.960.03= 2.40.2= 4.80.6= 9.60.3= 3.2424=3.240.24= 3.242.4= 2.42= 480.6= 963= 0.240.2= 练习（三）3.215100= 0.810= 4.08100= 1.10.2 = 0.60.8 = 30.9= 2.50.4= 3.60.4= 12.58= 500.04=
3、 800.3 = 1.19=0.165= 1.782.2 = 9.60.6 = 1.20.5= 0.70.01= 2.50.4= 123.9= 6.60.66= 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= 2.870.7 134 0.960.3 1.50.4 练习（四）0.920.4 0.20.26 0.144 0.020.1 1.20.3= 0.20.4 8.21.8 10035.22 2.342.50.4 2.45 0.224 3.250.5= 0.90.52 3.991 03.52 12
4、.58 810 = 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=练习（五）2.50.7= 10.13.3= 10.7512.5= 3.259.04= 12.58.8= 0.430.28= 6.450.73= 4.60.6= 8.90.05=3.080.43= 1.526.7= 5.2229= 18.723.6= 13.953.1= 810= 10-1.8-7.2= 0.43+3.57= 2
5、.5412= 0.90.8= 7.5x-3x= a+3a+7a=1.05100= 10.5= 0.963= 1.470.7= 5.46= 1280.4= 780.6= 9.63.2= 650.05= 540.12= 320.4= 360.18=练习（六）0.350.3= 1.45= 2.84= 、19.64= 22.54= 0.3961.2=0.7560.36= 15.613= 0.1815= 0.02514= 3.0636= 0.040.12 3.842.6= 5.763 7.1522= 90.753.3= 3.680.2= 16.90.13=1.553.9= 3.70.016= 13.76
6、0.8= 5.20.6= 8.41.3= 6.40.5= 4.480.4= 5.255= 35.44.2= 0.0420.54= 0.760.32= 0.250.046=2.523.4= 1.0825= 4.80.25 练习（七）70.25 2.50.70.8= 82.5161.6 5.61.01= 0.360.64= 64.3216 4.20.1 72.80.8 8.44.2 13.89.9 2.42.5 0.050.8 2.560.37 122.5 1.233 3.21.6 3.53.53 19.62= 8.82.2= 0.754 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= 练习（八）420.003= 780.06=
