五年级小数乘除法口算.doc
-!本页共100题5.460.5463.20.08124.840.4594.80.4140.4840.84120.680.17150.480.40.841.250.5183.939.20.440.81100.390.34.20.74.910011007.860.632.10.40.04240.7860.210.70.040.4250.780.65.85.87.20.08289.60.40.630.75.40.28320.960.40.280.140.70.02340.96450.51.80.01357.50.530.6360.6450.750.50.30.66.50.1365750.50.630.030.780.2856.30.076.321560.01688.194.91004.80.08728.10.9560.560.480.8740.810.90.40.040.488484.266.30.0905406954.20.060.720.080546754.20.64.7100540067100.420.065.60.28054605100.750.5360.65406151007.50.5650.135406151000本页共87题10.98100= 0.04810010= 6.910=56.2100= 0.810100= 0.0491000100=100100010= 368100= 0.3100=8.71000= 10.1100= 0.11001000.22410= 1.58100= 0.127 1000=2.710= 0.051000= 0.951000=110010=45.7-5.70.1= 0.123 10=0.7510100 = 0.48+0.16+0.52= 71.57-4.76-1.24=8.5+1.5-6.3= 1.8 0.1= 0.810.01=1.0251001000= 51000= 0.001101000=12.8100= 12.0710= 1.07100=1.54= 2.54= 0.13 4=5.410= 0.180.3= 8.5 1.7=4.21000= 0.450.15= 3.60.1=8.5100= 0 .0425= 0.0960.03=3.2100= 1.20.3 = 0.497=844.2= 10000.756= 0.5100=00.25= 10.01= 9.30.3=1.258= 3.82= 7.20.9=1.60.2= 2.10.3= 0.3216=40.4= 0.450.5= 0.20.01=0.165 1.782.2 = 9.60.6 =1.20.5-0.4 = 0.70.01 = 2.50.4 =12.50.8= 1 .2581.25 = 6.60.66 =5.370+4.63 = 3.92.03 1.6+2.40.3 = 2.140.9 2745673= 8(2.50.25)0.30.3= 7.22.8 0.90.013.53.53 2.50.70.8= (1.50.25)472.80.8 12.58= O .0425=小数乘除法口算练习(本页共113题)0.96= 0.20.5=600.5=1.54= 2.54= 0.70.8= 1.870=0.245= 0.20.6=0.51.1=0.60.02=1.254=0.21.7= 5.410= 0.180.3= 40.25= 0.48=1.80.5= 0.134= 8.71000= 2.510= 6.32.1=0.484= 0.80.5= 2.710= 80.4=80.5= 7.20.6= 8.5 1.7= 0.54= 0.5614= 1.60.8= 6.39= 0.450.15= 3.60.1= 0.10.8=0.40.25 1.40.4= 0 .0425=0.960.03= 4.21.4= 3.93.9= 06.81=3.2100= 1.20.3 =1.54= 2.54 = 0.13 4= 8.5100= 0.497=2.40.8= 5.410= 3.2100= 844.2= 10000.756=4.21000= 0.450.15= 3.60.1= 1.258= 3.82= 0 .70.8 = 8.5100= 9.30.3= 2.10.3= 0.3216=0. 80.3= 8.5 1.7= 1.20.3 = 12.0710= 1.07100=0.490.7= 0 .0425= 0.960.03= 0.450.5= 0.20.01=8.44.2= 00.25= 10.01= 9.30.3= 10000.756= 0.5100= 2.50.4= 1.60.2= 40.4=1.258= 3.82= 0.20.01= 0.5100= 00.25=7.20.9= 1.60.2= 0.450.5= 4.21000= 7.20.9= 0.54= 5.410= 4.21000= 0.450.15= 2.54 = 0.1 0.4= 2.40.8= 3.60.1= 20.5 = 1.258=8.5100= 3.2100= 1.80.3= 8.5 1.7= 1.20.3 = 0.490.7= 0 .0425= 0. 960.03= 7.29= 2.45=本页共100题5.460.5463.20.08124.840.4594.80.4140.4840.84120.680.17150.480.40.841.250.5183.939.20.440.81100.390.34.20.74.910011007.860.632.10.40.04240.7860.210.70.040.4250.780.65.85.87.20.08289.60.40.630.75.40.28320.960.40.280.140.70.02340.96450.51.80.01357.50.530.6360.6450.750.50.30.66.50.1365750.50.630.030.780.2856.30.076.321560.01688.194.91004.80.08728.10.9560.560.480.8740.810.90.40.040.488484.266.30.0905406954.20.060.720.0805406754.20.64.710054067100.420.065.60.280540615100.750.5360.605406151007.50.5650.1305406151000本页共90题10.98100= 0.04810010= 6.910=56.2100= 0.810100= 0.0491000100=100100010= 368100= 0.3100=8.71000= 10.1100= 0.1100100=0.22410= 1.58100= 0.127 1000=2.710=0.051000= 0.951000=110010= 45.7-5.70.1= 0.123 10=0.7510100= 0.48+0.16+0.52=71.57-4.76-1.24=8.5+1.5-6.3= 1.8 0.1= 0.810.01=1.0251001000= 51000= 0.001101000=12.8100= 12.0710= 1.07100=1.54= 2.54= 0.13 4=5.410= 0.180.3= 8.5 1.7=4.21000= 0.450.15= 3.60.1=8.5100= 0 .0425=0.0960.03=3.2100= 1.20.3 = 0.497=844.2= 10000.756= 0.5100=00.25= 10.01= 9.30.3=1.258= 3.82= 7.20.9=1.60.2= 2.10.3= 0.3216=40.4=0.450.5= 0.20.01=0.96= 0.20.5= 600.5=70.08= 1.870=0.245=0.051.6= 0.51.1= 0.80.5=60.12= 1.254= 6.21.7=40.25= 0.48= 1.80.5=2.510= 6.32.1= 0.924=801.6= 80.5= 7.20.6=0.5614= 1.60.8=6.39=0.158=0.40.251.470.4=本页共90题4.21.4= 3.93.9=06.81=1.54= 2.54 = 0.13 4=2.4-0.8= 5.410= 3.2100=4.21000= 0.450.15= 3.60.1=O .75+0.8 = 8.5100= 9.30.3=0.180.3= 8.5 1.7= 1.20.3 =0.490.7= O .0425= 0.0960.03=844.2= 00.25= 10.01=10000.756= 0.5100= 2.51.470.4=1.258= 3.82= 0.20.01=7.20.9= 1.60.2= 0.450.5=0.452.5 0.81.25 0.33.6= 0.30.3 100.07 0.31.4 0.057 0.920.4 0.20.260.144 0.020.1 1.20.30.20.4 8.21.8 10035.22 2.34 2.50.4 2.45 0.224 3.250 0.90.52 3.991 03.52 12.58810 = 10-1.8-7.2= 0.43+3.57= 2.5412= 0.90.8= 10.5=0.963= 1.470.7= 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 =本页共96题5.370+4.63 = 3.92.03 4.23.51.6+2.40.3 = 2.140.9 2745673=0.30.3= 7.22.8 0.90.01120.3= 2.870.7 1340.960.31.50.4 70.252.50.70.8= 82.5 161.65.61.01= 8(2.50.25) 0.360.6464.3216 4.20.1 72.80.88.44.2 13.89.9 2.42.50.050.8 2.560.37 1.250.80.5122.5 1.2333.21.6=3.53.5319.62 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=据216326912,很快写出下面各题的积。21.632 216032 0.216322.1632 216320 2160320根据10814515660,直接写出下列各式的积。10.81.45 1.081450 0.10814.5 1.080.145 0.010814500 10.80.145 口算0.87 1.57 1.3280.78 10.32 50.63.2123 3.212.3 32.12.332.10.23 3.210.23 3210.0230.90.3 3.50.2 2.010100.05 0.137 0.211000.74 0.054 40.3 12.58 2.34 3.250 0.450 300.1 2.63 4.12 0.350.2 7.50.1本页共114题0.90.3 10.06 90.51.258 10.73 0.68 2.05100 0.040.3 0.40.25 1.258 1.65 0.91.40.20.4 8.21.8 10035.222.50.4 2.45 0.2240.90.52 3.991 03.527.26 4.44 3.635.22 1.53 1.20.43.63 2.73 0.123 0.459 3.66 2.72 1.23 0.454 2.55 8.47 0.3417 2.50.5 8.40.7 0.340.17 30.44 1.26 0.720.6 2.61.30.60.3 03.65 7.821 1.40.7 3.60.06 5.60.9 0.480.8 4.40.11 4.23 0.30.01 40.5 5.10.17 0.90.45 9.616 10.01 34 8.19 2.54 3.66.3 0.054 3.50 10.08 3.50.01 1.250.25 3.90.39 4.85.2 0.50.4 6.44 1.50.3 4.23 7.20.9 2.30.1 2.26 0.1258 4.50.9 2.54 2.54 0.30.1 4.22.1=990.1 430.01 7.10.1= 700.001= 2.51510= 1.10.4=0.326100= 0.10.01= 0.870.6=0.20.6= 4.60.46= 0.0010.1 20.640.36 1.253.30 37.29937.25.61.409.8 40.251.858.40.4 1.94 1.60.8= 0.5252=3.20.40.281.40.011 60.02503.565= 0.20.4=2.951.953.在( )里填上适当的数。0.420.7( )7 0.380.19( )19 0.2170.85( )85 21.281.4( )14 5.1751. 5( )85 32.340.21( )21不计算,直接写出下列各式的积是几位数。 3.50.7 ( ) 4.90.05 ( ) 51.7 ( ) 4.250.27 ( ) 450.09 ( ) 17.020.3 ( )把下列各题改成除数是整数的除法。 360.36( )( ) 0.090.3( )( ) 146.40.024( )( ) 5.60.35( )( ) 241.50.35( )( ) 270.30.106( )( )不计算比较下列各式的大小。 3.050.9 3.05 7.921.1 7.92 38.41.01 38.4 5.340.8 5.34不计算,在下面的圆圈里填上“” 、“”或“”。3.61.1 3.6 3.60.9 3.6 3.61 3.6 3.61.1 3.6 3.60.9 3.6 3.61 3.64、根据第一栏的积,很快写出后面每栏中的积。因数32320323.20.320.320.32因数151515015151.50.15积480根据表中第一栏的结果,把表格填写完整。被除数9459.459450.945除数27270.272.70.027商3536 用“四舍五入法”算出商的近似值,填入下表。精确到个位精确到十分位精确到百分位精确到千分位3267.54.313.20.875.填空。6.9 0.75 3.63.93.9 0.131.570.5 2.1
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年级
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口算
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本页共100题
5.46=
0.546=
3.20.08=
12=
4.84=
0.459=
4.80.4=
14=
0.484=
0.8412=
0.680.17=
15=
0.480.4=
0.841.2=
50.5=
18=
3.93=
9.20.4=
40.8=
110=
0.390.3=
4.20.7=
4.9100=
1100=
7.86=
0.632.1=
0.40.04=
24=
0.786=
0.210.7=
0.040.4=
25=
0.780.6=
5.85.8=
7.20.08=
28=
9.60.4=
0.630.7=
5.40.28=
32=
0.960.4=
0.280.14=
0.70.02=
34=
0.964=
50.5=
1.80.01=
35=
7.50.5=
30.6=
360.6=
45=
0.750.5=
0.30.6=
6.50.13=
65=
750.5=
0.630.03=
0.780.2=
85=
6.30.07=
6.321=
560.01=
68=
8.19=
4.9100=
4.80.08=
72=
8.10.9=
560.56=
0.480.8=
74=
0.810.9=
0.40.04=
0.488=
48=
4.26=
6.30.09=
0.540.6=
95=
4.20.06=
0.720.08=
0.546=
75=
4.20.6=
4.710=
0.540.06=
710=
0.420.06=
5.60.28=
0.5460=
510=
0.750.5=
360.6=
540.6=
15100=
7.50.5=
650.13=
5.40.6=
151000=
本页共87题
10.98100= 0.04810010= 6.910=
56.2100= 0.810100= 0.0491000100=
100100010= 368100= 0.3100=
8.71000= 10.1100= 0.1100100
0.22410= 1.58100= 0.127 1000=
2.710= 0.051000= 0.951000=
110010=45.7-5.70.1= 0.123 10=
0.7510100 = 0.48+0.16+0.52= 71.57-4.76-1.24=
8.5+1.5-6.3= 1.8 0.1= 0.810.01=
1.0251001000= 51000= 0.001101000=
12.8100= 12.0710= 1.07100=
1.54= 2.54= 0.13 4=
5.410= 0.180.3= 8.5 1.7=
4.21000= 0.450.15= 3.60.1=
8.5100= 0 .0425= 0.0960.03=
3.2100= 1.20.3 = 0.497=
844.2= 10000.756= 0.5100=
00.25= 10.01= 9.30.3=
1.258= 3.82= 7.20.9=
1.60.2= 2.10.3= 0.3216=
40.4= 0.450.5= 0.20.01=
0.165 ﹦ 1.78+2.2 = 9.60.6 =
1.20.5-0.4 = 0.70.01 = 2.50.4 =
12.50.8= 1 .2581.25 = 6.60.66 =
5.370+4.63 = 3.9+2.03= 1.6+2.40.3 =
2.14-0.9= 27+456+73= 8(2.5+0.25)=
0.30.3= 7.2+2.8= 0.90.01=
3.5+3.53= 2.50.70.8= (1.5+0.25)4=
72.80.8= 12.58= O .0425=
小数乘除法口算练习(本页共113题)
0.96= 0.20.5=600.5=1.54= 2.54= 0.70.8=
1.870=0.245= 0.20.6=0.51.1=0.60.02=1.254=
0.21.7= 5.410= 0.180.3= 40.25= 0.48=
1.80.5= 0.134= 8.71000= 2.510= 6.32.1=
0.484= 0.80.5= 2.710= 80.4=80.5=
7.20.6= 8.5 1.7= 0.54= 0.5614= 1.60.8=
6.39= 0.450.15= 3.60.1= 0.10.8=
0.40.25= 1.40.4= 0 .0425=0.960.03=
4.21.4= 3.93.9= 06.81=3.2100= 1.20.3 =
1.54= 2.54 = 0.13 4= 8.5100= 0.497=
2.40.8= 5.410= 3.2100= 844.2= 10000.756=
4.21000= 0.450.15= 3.60.1= 1.258= 3.82=
0 .70.8 = 8.5100= 9.30.3= 2.10.3= 0.3216=
0. 80.3= 8.5 1.7= 1.20.3 = 12.0710= 1.07100=
0.490.7= 0 .0425= 0.960.03= 0.450.5= 0.20.01=
8.44.2= 00.25= 10.01= 9.30.3= 10000.756=
0.5100= 2.50.4= 1.60.2= 40.4=
1.258= 3.82= 0.20.01= 0.5100= 00.25=
7.20.9= 1.60.2= 0.450.5= 4.21000= 7.20.9=
0.54= 5.410= 4.21000= 0.450.15= 2.54 =
0.1 0.4= 2.40.8= 3.60.1= 20.5 = 1.258=
8.5100= 3.2100= 1.80.3= 8.5 1.7= 1.20.3 =
0.490.7= 0 .0425= 0. 960.03= 7.29= 2.45=
本页共100题
5.46=
0.546=
3.20.08=
12=
4.84=
0.459=
4.80.4=
14=
0.484=
0.8412=
0.680.17=
15=
0.480.4=
0.841.2=
50.5=
18=
3.93=
9.20.4=
40.8=
110=
0.390.3=
4.20.7=
4.9100=
1100=
7.86=
0.632.1=
0.40.04=
24=
0.786=
0.210.7=
0.040.4=
25=
0.780.6=
5.85.8=
7.20.08=
28=
9.60.4=
0.630.7=
5.40.28=
32=
0.960.4=
0.280.14=
0.70.02=
34=
0.964=
50.5=
1.80.01=
35=
7.50.5=
30.6=
360.6=
45=
0.750.5=
0.30.6=
6.50.13=
65=
750.5=
0.630.03=
0.780.2=
85=
6.30.07=
6.321=
560.01=
68=
8.19=
4.9100=
4.80.08=
72=
8.10.9=
560.56=
0.480.8=
74=
0.810.9=
0.40.04=
0.488=
48=
4.26=
6.30.09=
0.540.6=
95=
4.20.06=
0.720.08=
0.540.6=
75=
4.20.6=
4.710=
0.540.6=
710=
0.420.06=
5.60.28=
0.540.6=
1510=
0.750.5=
360.6=
0.540.6=
15100=
7.50.5=
650.13=
0.540.6=
151000=
本页共90题
10.98100= 0.04810010= 6.910=
56.2100= 0.810100= 0.0491000100=
100100010= 368100= 0.3100=
8.71000= 10.1100= 0.1100100=
0.22410= 1.58100= 0.127 1000=
2.710=0.051000= 0.951000=
110010= 45.7-5.70.1= 0.123 10=
0.7510100= 0.48+0.16+0.52=71.57-4.76-1.24=
8.5+1.5-6.3= 1.8 0.1= 0.810.01=
1.0251001000= 51000= 0.001101000=
12.8100= 12.0710= 1.07100=
1.54= 2.54= 0.13 4=
5.410= 0.180.3= 8.5 1.7=
4.21000= 0.450.15= 3.60.1=
8.5100= 0 .0425=0.0960.03=
3.2100= 1.20.3 = 0.497=
844.2= 10000.756= 0.5100=
00.25= 10.01= 9.30.3=
1.258= 3.82= 7.20.9=
1.60.2= 2.10.3= 0.3216=
40.4=0.450.5= 0.20.01=
0.96= 0.20.5= 600.5=
70.08= 1.870=0.245=
0.051.6= 0.51.1= 0.80.5=
60.12= 1.254= 6.2+1.7=
40.25= 0.48= 1.80.5=
2.510= 6.32.1= 0.924=
801.6= 80.5= 7.20.6=
0.5614= 1.60.8=6.39=
0.158=0.40.25=1.470.4=
本页共90题
4.21.4= 3.93.9=06.81=
1.54= 2.54 = 0.13 4=
2.4-0.8= 5.410= 3.2100=
4.21000= 0.450.15= 3.60.1=
O .75+0.8 = 8.5100= 9.30.3=
0.180.3= 8.5 1.7= 1.20.3 =
0.490.7= O .0425= 0.0960.03=
844.2= 00.25= 10.01=
10000.756= 0.5100= 2.51.470.4=
1.258= 3.82= 0.20.01=
7.20.9= 1.60.2= 0.450.5=
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= 1.20.3=
0.20.4= 8.2+1.8= 100-35.22=
2.34= 2.50.4= 2.45=
0.224= 3.250= 0.9-0.52=
3.991= 03.52= 12.58=
810 = 10-1.8-7.2= 0.43+3.57=
2.5412= 0.90.8= 10.5=
0.963= 1.470.7= 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 ﹦ 1.78+2.2 = 9.60.6 =
1.20.5-0.4 = 0.70.01 = 2.50.4 =
12-3.9= 1 .2581.25 = 6.60.66 =
本页共96题
5.370+4.63 = 3.9+2.03= 4.23.5=
1.6+2.40.3 = 2.14-0.9= 27+456+73=
0.30.3= 7.2+2.8= 0.90.01=
120.3= 2.870.7= 134=
0.960.3=1.50.4= 70.25=
2.50.70.8= 8-2.5= 161.6=
5.61.01= 8(2.5+0.25)= 0.36+0.64=
64.3216= 4.20.1= 72.80.8=
8.44.2= 13.8+9.9= 2.42.5=
0.050.8= 2.56-0.37= 1.250.80.5=
122.5= 1.233=3.21.6=
3.5+3.53=19.62= 8.82.2=
0.754= (1.5+0.25)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=
5.46+4.54= 12.50.8= 0.350.3=
1.45= 2.84= 19.64=
据21632=6912,很快写出下面各题的积。
21.632= 216032= 0.21632=
2.1632= 216320= 2160320=
根据108145=15660,直接写出下列各式的积。
10.81.45= 1.081450= 0.10814.5=
1.080.145= 0.010814500= 10.80.145=
口算
0.87= 1.57= 1.328=
0.78= 10.32= 50.6=
3.2123= 3.212.3= 32.12.3=
32.10.23= 3.210.23= 3210.023=
0.90.3= 3.50.2= 2.010=
100.05= 0.137= 0.21100=
0.74= 0.054= 40.3=
12.58= 2.34= 3.250=
0.450= 300.1= 2.63=
4.12= 0.350.2= 7.50.1=
本页共114题
0.90.3= 10.06= 90.5=
1.258= 1-0.73= 0.68=
2.05100= 0.040.3= 0.40.25=
1.258= 1.65= 0.9+1.4=
0.20.4= 8.2+1.8= 100-35.22=
2.50.4= 2.45= 0.224=
0.9-0.52= 3.991= 03.52=
7.26= 4.44= 3.63=
5.22= 1.53= 1.20.4=
3.63= 2.73= 0.123=
0.459= 3.66= 2.72=
1.23 = 0.454= 2.55=
8.47= 0.3417= 2.50.5=
8.40.7= 0.340.17= 30.44=
1.26= 0.720.6= 2.61.3=
0.60.3= 03.65= 7.821 =
1.40.7= 3.60.06= 5.60.9=
0.480.8= 4.40.11= 4.23 =
0.30.01= 40.5= 5.10.17=
0.90.45= 9.616= 10.01 =
34= 8.19= 2.54=
3.6+6.3= 0.054= 3.50=
1-0.08= 3.50.01= 1.250.25=
3.9+0.39= 4.8+5.2= 0.50.4 =
6.44﹦ 1.50.3﹦ 4.23﹦
7.20.9﹦ 2.30.1﹦ 2.26﹦
0.1258﹦ 4.50.9﹦ 2.54﹦
2.54﹦ 0.30.1﹦ 4.22.1=
99+0.1﹦ 430.01﹦ 7.10.1=
700.001= 2.51510= 1.10.4=
0.326100= 0.10.01= 0.87-0.6=
0.20.6= 4.60.46= 0.0010.1=
2-0.64-0.36﹦ 1.253.30﹦ 37.299+37.2﹦
5.61.4= 09.8= 40.25= 1.85﹦
8.40.4﹦ 1.94﹦ 1.60.8=
0.5252= 3.20.4= 0.281.4=
0.011= 6-0.025= 03.5=
65= 0.20.4= 2.95-1.95﹦
3.在( )里填上适当的数。
0.420.7=( )7 0.380.19=( )19
0.2170.85=( )85 21.281.4=( )14
5.1751. 5=( )85 32.340.21=( )21
不计算,直接写出下列各式的积是几位数。
3.50.7 ( ) 4.90.05 ( ) 51.7 ( )
4.250.27 ( ) 450.09 ( ) 17.020.3 ( )
把下列各题改成除数是整数的除法。
360.36=( )( ) 0.090.3( )( )
146.40.024=( )( ) 5.60.35=( )( )
241.50.35=( )( ) 270.30.106=( )( )
不计算比较下列各式的大小。
3.050.9 3.05 7.921.1 7.92
38.41.01 38.4 5.340.8 5.34
不计算,在下面的圆圈里填上“>” 、“<”或“=”。
3.61.1 3.6 3.60.9 3.6 3.61 3.6
3.61.1 3.6 3.60.9 3.6 3.61 3.6
4、根据第一栏的积,很快写出后面每栏中的积。
因数
32
320
32
3.2
0.32
0.32
0.32
因数
15
15
150
15
15
1.5
0.15
积
480
根据表中第一栏的结果,把表格填写完整。
被除数
945
9.45
945
0.945
除数
27
27
0.27
2.7
0.027
商
35
36
用“四舍五入法”算出商的近似值,填入下表。
精确到个位
精确到十分位
精确到百分位
精确到千分位
326
7.54.3
13.20.87
5.填空。
6.9
0.75 +3.6
3.9
3.9 0.13
1.57
-0.5 2.1
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