1、0.22= 2.84.58= 3.574.2= 82.836= 452.46= 3.60.24= 382.545= 6.45.48= 13.424.73 = 9.658.12 = 7.231.2 = 6.312 = 2.148.3 = 4.91.12 = 21.982.31 = 0.2428.37 = 29.133.14 = 9.8811.21 = 5.511 = 7.50.5 = 61.2 = 3.28 = 7.20.9 = 241.2 = 120.12 = 6.750.25 = 120.75 = 210.7 = 16.90.13= 1.553.9= 3.70.016= 5.636.1= 0
2、.30.15= 0.50.12= 0.630.63= 1.45= 0.10.01= 0.358= 7.357= 10.01= 4.6922.3= 5.52.02= 3.140.68= 3.071.5= 5.261.6= 0.856.3= 52.60.252= 35734、判断。(1)如果两个因数的积不是小数,那么这两个因数一定不是小数。( )(2)一个不等于0的数的1.02倍一定比原数大。 (3)因为1235=420,所以1.23.5=42.(4)在表示近似数时,5.0也可以写成5。(5)整数乘法的交换律、结合律和分配律,对于小数乘法同样适用。(6)0.259.9=0.25(10-1)=0.2
3、510-0.25。(7)4.10与4.1大小相等,表示意义也相同。(8)3.994精确到百分位约是4.00.(9)一个数(0除外)除以小数,商一定比这个数大。(10)两个数相除的商是0.9,被除数不变,除数扩大10倍,商是9.(5、把下列各式中的乘积点上小数点,使等式成立。 9.362.7=25272 0.896.43=57227 52.11.98=103158 26.153.4=88914.50.09= 2.53.3= 50.4= 2.364.58= 3.5736= 450.24= 382.55.48= 13.428.12 = 7.2312 = 2.141.12 = 21.9828.37 =
4、 29.1311.21 = 92040= 78060= 96040= 7997= 2832 5425 4861 2337= 4658= 32652= 4512 3312= 3269= 0.828 36 97.2 24 7.65 0.85 12.6 0.28 8.61 2.1 58.75 0.25 220.3 0.7 58.8 0.28 58.9 31 7.67 5.9 83.2 3.2 97.2 5.4 8.424 1848 23184 7.6525 0.9835 2.52525 8456 140.73 8 2.872 1.562.4= 1.440.015= 2.8980.18= 85.441
5、6 42.847 101.79 67.515 230.46 21.2436 0.73623 43.512 35.217 39.624 6.210.0385.4416 42.847915230.46 21.2436 0.736231235.21 39.624 6.210.03 2101.451.30.27 91.23.8 0.7560.18 0.660.311.971.5 69.62.9 38.40.8 150.06 0.828 0.85 12.6 0.28 8.61 0.7 58.8 58.9 3.2 97.2 5.4 8.4184 7.6525 0.9825 8456 140.73 82.8
6、72 1.560.015= 2.89816 42.847 101.79 67.515 230.46 21.2436 0.73623 43.512 35.217 39.624 6.210.03 85.4416 42.847101.76 21.2436 7 39.624 0.03 2101.4 51.30.27 91.23.8 0.7560.18 0.660.3 11.971.5 69.62.9 0.8 150.06 1.440.18= 1.440.015= 2.8980.18= 0.3288= 3.513= 7.217= 2325= 3.6414= 37.828= 60050= 420.16=
7、840.25= 0.360.9= 2.43= 200.5= 0.86= 10000.09= 1.3527= 580.32= 1.0852= 8.50.54= 5.622.4= 0.280.16= 1.060.82= 0.060.75= 0.412.01= 0.630.12= 3.52.01 1.260.84=1.456.5+0.556.5 6.1299+6.12 5.9101-5.9 8( )=0.8 25.8( )=0.258 452( )=45.2 70( )=0.7800.9( )=80.09 360( )=0.36 6.541.04= 0.5220.18=337.5= 100.8= 0
8、.60.015= 0.5320.4=0.050.025= 0.210.012= 3.64.8= 8.010.9=0.510.85= 6.30.42= 25.263= 0.45616.43+3.6= 21.5-20.83= 5.7+4.33= 20.1-6.9=0.65+19.5= 0.293.18(保两) 4.482.8+1.535.4-9.6(2.65-1.05) 6.3【(0.9+1.8)4.5】以下简便运算12.5320.25 29.4+1.72+3.56 5.17-1.8-3.213.75-(3.75-6.48) 3.45+7.7+16.55+1.3 21.63-(8.5+9.63)3
9、6.59-(6.59+7.3) 7.23+6.84-0.84+2.770.31212= 420.16= 840.25= 580.32=1.0852= 540.47= 4203.5= 9.31001000=28710.33= 50-16.66= 60.73= 3.820.45=3.14.05= 0.5220.18= 7.540.26= 91.20.024=1、用竖式计算0.3961.2= 0.7560.36=7.1522= 90.753.3=3.680.25= 16.90.131.553.9=3.70.016=13.760.8= 5.20.6 8.41.3 = 13.953.1=6.42.5= 4.484.4= 5.25= 4.60.6=35.44.2= 0.0420.540.760.32 0.250.046= 0.450.73= 0.430.28=2.523.4= 1.0825=0.120.50.16(保留两位小数) 3.259.04= (用除法验算)4.80.25 0.1251.4 10.7512.5=(用乘法验算)2.50.7=(保留三位小数)10.1(商用循环小数表示)8.90.05= 3.080.43=1.526.7= 5.2229=18.723.6= 2.57.14 =16.129916.12=5.20.90.9= 7.
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