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
7、= 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= 450.005= 810.03= 7.20.002= 10001.25= 102.5= 1200.024= 7.55= 8.60.002= 0.00363.6= 8.62=2.50.005= 0.360.0006= 7.52= 6.321= 8.60.0043= 460.0023= 8.40.0084= 1.283.2= 9.80.7= 4.60.023= 0.0090.005= 390.0003=133.00
8、07= 5.050.5= 1230001.23= 0.0012550= 5.6700= 7600.008= 4.3296= 4920.004= 18.630.03= 练习（九）9.599= 13.50.98= 0.1-0.047=0.292.9= 3.40.2= 0.5719= 63+124+76= 7.0910.8= 0.87.09= 9.5101= 3.810.1= 7.69101= 3.810.1= 0.12572= 719+7=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-
9、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= 练习（十）102576832= 645-4512= 10-2.87-7.13= 0.96+9.69.9= 40119+284= 640+12845= 1.2581.25= 5.370+4.63= 2.57.14= 16.129916.12=5.0-0.90.9= 7.2899+7.28= 4.3500.2= 642.640.5= 3.94+34.30.2= 8.91.14.7=2.75.43.9= 3.69.85-5.46= 8.053.4+7
10、.6= 6.584.50.9= 2.80.5+1.58= 324.90.9=练习（十一）70+5050+70= 13.7+0.98+0.02+4.3=18.63.470.53= 7210172= 235283528= 2.678+787.4= 7.26-(5.26-1.5)= 8(2.50.25)1.250.80.5 （1.50.25)4 0.120.50.16 7.2899+7.28= 4.3500.2= 543618 =10245-328= 1001903618= 3.85.25+14.5= 300-426321= 0.810.25+5.96= 4031327=(25+4)4= （1.2+
11、 1.8)4.5= 练习（十二）526+301= 223-99= 0.452.5 0.81.25 0.33.6 0.30.3100.07 0.31.4 0.057 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 12.58 5.42.51.4= 2.51.250.32= 126.23.8= (180+20)5= 1.7+0.43+3.3= 75254= 2502505= 练习（十三）4.84.80.5= (1.250.1
12、25)8= 4.8100.1= 56.59956.5= 4.85+0.351.4= 0.873.16+4.64=40.50.810.18= 4.8(15 2.4)= 2.1308257= 6.81+6.8199= 0.2518540= 2.5(3.80.04)=0.2539+0.25= (85.27)1.25= 6.81+6.8199= 0.2518540= 6.80.750.5= 3.750.1252.75=1.53+23.47.2= 1.2+3.2+0.8 = 1.22.54 = 3.01+1.7+0.99 = 练习（十四）10.666 = 2.7-2.72.7=5.4(0.510.17)
13、= 0.7899+0.78= 5.4(7.266.05)= 8.717.4-8.77.4= 12.50.42.58= 0.68（5.2-3.5)1.25= (0.25+2.5+25)0.4= 5-0.90.2+1.80.5= 6.43.28+4.63.28-3.28= 12.2721(7.36.6)2.4= 4.40.83.40.8= (9.37+9.37+9.37+9.37)2.5= 2.376.3+2.373.7= 460.33+540.33= 1.93+2.7+2.07+7.3= 2615.715.724= (2.275 0.625)0.28= 85.07(15.34.8)+5.369=
14、 40（3.52.75+0.86）= 3725+26867= 练习（十五）（32+36045）72= （75903314）54= 412（6073614） 10.5(5.2-3.5)= （13.88.7）0.034= 6.25+3.85-2.125+3.875= 3.375+5.75+2.25+6.625= 2.14.3+5.72.1= 3.3750.97+0.976.625= 6.54+2.4+3.46+0.6= 95.61.8+95.68.2= 1.54.20.750.25= 3.274 +3.275.7= 0.25800.450.9= 2.4+2.4(5.375-3.375)= 7.5-
15、5.713= 练习（十六）12.37-3.25-6.75= 166.8+2.216+16= 58.7-16.653.7= 0.44.72.5+(2.3+5.3)= 9.31-1.125-7.875= 400(0.62+0.08)= 1.2(9.62.4)4.8= （8.583.69）（3.41.8）= 1.5（10.0315.67.5）= 30.6（4.50.16）= 4.7+3.91(32-29.7)= 3.12（0.90.70.1）= 9.2+9.7283.21.5= 2.40.751.252.5= （20.20.62.12）0.1= (1.50.9+3.65)2.5= 练习（十七）8.4
16、80.80.9= 1010.36（14.40.05）= (25.3-9.7)0.38.5= 10.5(5.14.4)+18.25= 4.110.72(3.382.13）= 102511254.53.6= （6.85.4）2.750.9= 0.87536+4.058.1= （227254.68）0.5= 630（2.986.50.08）= (21.88+29.8) 7.6= (8.15.4)3.685.7= (3.44+20.50.32)0.16= 0.54(8.745.3)28.4= 0.11+10.80.1=练习（十八）（1.256.4）14.882.4= (4.32.012.2)4=58.
17、8（0.60.7）0.02= 10.47.79（0.350.6）=3.6（1.20.5）5= 13.70.253.74=3.61.25+ 0.320.4= 0.8(3.22.992.3)=2.5(69.7283.2)= 5.2(4.60.920.04)=5.4(3.940.86)0.8= 19.281.820.7=10.563.753.750.56= (1.5 0.81)0.4=练习（十九）（37.62+20.76）0.042= （17.2-4.53.6）0.32=(6.02 + 2.8 )0.4 - 2.05= 3.27（80.5-9.840.16）=(71.271.20.9)0.25= 1
18、.08（3.94+34.30.2）=（4.25-4.250.8）1.7= 1.465+12.80.47.5=1.521.655.7= 3.8（24250.6）=(0.25 +0.125）（0.750.4)= 202.548=(4.84.80.5)2= 0.8（10.40.64）0.92=练习（二十）(25.3-9.7)0.37.6= （4.5+1.36）1.5=58.8（0.60.7）0.02= 0.4(3.2-0.8)1.2=16.78-1.61.50.8= (53.73-17.49)(2.6+12.4)=18.644.35220.9= 808.2（107.6）=(98.5)(54.76)0
19、.1= 1.68.41.50.18=（1.1-0.78）（2.7-1.95）= （20.20.62.80.4=0.06(10.140.64)2= 17.685.2+2.71.5=练习（二十一）19.8+(3.749-0.299)2.3= 8.6+15.40.41.4=1.51.20.62.4= 0.6（6.252.50.25）=4.3215125.10.85= 5.6(12.58.5 0.85)=8.74 - 8.7423+7000.03= 0.38+9.623.75.4=4.38（36.94+34.30.2）= （5.84-3.9）0.4+0.15=1.6(2.25+27.751.5)= 2.021.0270.26）=6.5(10-3.7)+2.98= 4.75+8.4(9.2-6.8)= 页脚
