1、乘法：5.62.9=16.24 3.771.8=6.786 0.0296=1.925.220.3=1.566 9.990.02=0.1998 4.670.9=4.20352.44=12.2 1.6666.1=10.1626 9.4320.002=0.0188645.66.5=36.4 4.882.9=14.152 5.614.3=24.1238.92.4=21.36 5.555=302.5 9.770.02=0.19541.3845.1=7.0584 8.7883=728.74 2.661=158.60.0590.2=0.0118 4.2681.7=7.2556 575.7=324.99.46
2、2.85=26.961 17.86.4=113.92 1.54.9=7.352.50.88=2.2 5.5555.2=28.886 2.223.33=7.39267.65885=650.93 36.020.3=10.806 56.788=454.24除法：85.4416=5.34 42.847=6.12 101.79=11.367.515=4.5 230.46=38.4 21.2436=0.590.73623=0.032 43.512=3.625 35.217=5.0339.624=1.65 6.210.03=207 2101.4=15051.30.27=190 91.23.8=24 0.75
3、60.18=4.20.660.3=2.2 11.971.5=7.98 69.62.9=2438.40.8=48 150.06=250 （循环小数的用简便方法，除不尽保留 2 位小数）：8.20.12=68.33 0.80.9=0.88 76.45.4=14.1481484.73=1.566 1.251.2=1.04166 3242=0.76190476190414.362.7=5.3185185 8.336.21.34 1.70.03=56.662.410.7=3.44285714285714 计算0.3961.2=0.33 0.7560.36=2.1 15.613=202.80.1815=2
4、.7 0.02514=0.35 3.0636=110.160.040.120.0048 3.842.610.0（保留一位小数） 5.76317.287.1522=157.3 90.753.3=27.5 3.680.25=0.9216.90.13=130 1.553.9=0.39743589743589 3.70.016=0.059213.760.8=11.008 5.20.6=3.12 8.41.3=10.926.40.5=3.2 4.480.4=1.792 5.255=26.2535.44.2=148.68 0.0420.54=0.02268 0.760.32=0.24320.250.046
5、=0.0115 2.523.4=8.568 1.0825=270.120.50.160.0096 4.80.251.20.1251.40.18（保留两位小数） 2.50.73.571（保留三位小数）10.13.3=3.0606（商用循环小数） 10.7512.5=0.86（用乘法验算）3.259.04= 29.38（用除法验算）3、脱式计算（能简算的要简算）2.57.14 16.129916.12 5.20.90.9=（2.54）7.1 =16.12（99+1） =（5.2+1）0.9=107.1 =16.12100 =6.20.9=71 =1612 =5.587.2899+7.28 4.35
6、00.2 642.640.5=7.28（99+1） =4.3（500.2） =64-1.32=7.28100 =4.310 =62.68=728 =432615.715.724 (2.275 0.625)0.28 =（26+24）15.7 =2.90.28=5015.7 =0.812=78.53.94+34.30.2 1.2(9.62.4)4.8=3.94+6.86 =1.244.8=10.8 =4.84.8=18.91.14.7 2.75.43.9 3.69.85-5.46=9.794.7 =14.583.9 =35.46-5.46=46.013 =56.862 =308.053.4+7.6
7、 6.584.50.9 2.80.5+1.58=27.37+7.6 =29.610.9 =1.4+1.58=34.97 =26.649 =2.98324.90.9 4.84.80.5 (1.250.125)8=36.9-0.9 =4.8-2.4 =1.258-0.1258=36 =2.4 =10-1=94.8100.1 56.59956.5 7.0910.80.87.09=4.8100+4.80.1 =56.5（99+1） =7.09（10.8-0.8）=480+0.48 =56.5100 =7.0910=480.48 =5650 =70.94.85 + 0.35 1.4 8.7 17.4 -
8、 8.7 7.4=4.85+0.25 =8.710=5.1 =8712.50.42.58 0.873.16+4.64 9.5101 =(12.58)(0.42.5) =2.7492+4.64 =9.5100+9.5=1001 =7.3892 =950+9.5=100 =959.50.68 （5.2 -3.5） 1.25 40.5 0.81 0.18 =0.681.71.25 =500.18=0.41.25 =9=0.54.8 （15 2.4） 6.81+6.8199 0.2518540 =4.86.25 =6.81(1+99) =(0.2540)185=30 =6.81100 =10185=6
9、81 =18504.40.83.40.8 (9.37+937+937+937) 25 =(4.4-3.4) 0.8 =(9.374) 2.5=10.8 =9.37(42.5)=0.8 =9.3710=93.72.376.3+2.373.7 2.51.250.32 =2.37(6.3+3.7) =2.51.250.40.8=2.3710 =(2.50.4) (1.250.8)=23.7 =11=13.810.1 2.5(3.80.04) 7.69101 =3.8 10+3.80.1 =2.50.043.8 =7.69100+7.69=38.38 =0.38 =776.690.2539+0.25
10、0.12572 460.33+540.33=0.25(39+1) =0.12589 =(46+54) 0.33=0.2540 =19 =1000.33=10 =9 =33(85.27) 1.25 6.81+6.8199 0.2518540=(81.25) 5.27 =6.81(1+99) =0.2540185=105.27 =6.81100 =10185=52.7 =681 =18506.80.750.5 3.750.1252.75 1.53+23.47.2=5.10.5 =30-2.75 =1.53+3.25=10.2 =27.25 =4.789.599 13.50.98 12.58.8=9.5(100-1) =13.5(1-0.02) =12.5(8+0.8)=9.5100-9.5 =13.5-13.50.02 =12.58+12.50.8=950-9.5 =13.5-0.27 =100+10=940.5 =13.23 =110
