68.8÷4＝85.44÷16＝243.2÷64＝1.35÷27＝67.5÷15＝289.9÷18＝15.6÷24＝3.64÷52＝26÷0.13＝126÷45＝101.7÷9＝0.138÷15＝91.2÷3.8＝210÷1.4＝16.8÷28＝0.416÷32＝51.3÷0.27＝10.625÷25＝0.756÷0.18＝2.688÷0.56＝10÷25＝2.7÷7.5＝8.33÷6.2≈2.41÷0.7≈19.8÷3.3=15÷0.06＝1.7÷0.03≈4.5×0.07=5÷0.25=25.6÷0.032＝14.36÷2.7≈1.25÷1.2≈2.5×3.6=32÷42≈6.3÷0.09=0.76÷0.4=82.8÷36=2.36×0.22=2.8×4.58=3.57÷4.2=45×2.46=3.6÷0.24=9.65×8.12=4.9×1.12=9.88×11.21=3.2÷8=382.5÷45=6.4×5.48=6.3×12=13.42×4.73=2.14×8.3=29.13×3.14=6÷1.2=7.23×1.2=21.98×2.31=0.24×28.37=5.5÷11=7.5÷0.5=7.2÷0.9=24÷1.2=12÷0.12=16.9÷0.13=0.3÷0.15=0.1×0.01=4.692÷2.3=6.75÷0.25=12÷0.75=3.7×0.016=0.6×3÷0.6×3=7.35÷7=21÷0.7=5.63÷6.1=1.4×5=1.55÷3.9=0.5×0.12=0.35×8=1÷0.01=5.5×2.02=3.14×0.68=3.07×1.5=5.26÷1.6=0.85×6.3=52.6×0.252=35÷73=4、判斷。（1）如果兩個因數(shù)的積不是小數(shù)，那么這兩個因數(shù)一定不是小數(shù)。（）（2）一個不等于0的數(shù)的1.02倍一定比原數(shù)大。（）（3）因為12×35=420，所以1.2×3.5=42.（）（4）在表示近似數(shù)時，5.0也可以寫成5。（）（5）整數(shù)乘法的交換律、結(jié)合律和分配律，對于小數(shù)乘法同樣適用。（）（6）0.25×9.9=0.25×（10-1）=0.25×10-0.25。（）（7）4.10與4.1大小相等，表示意義也相同。（）（8）3.994精確到百分位約是4.00.（）（9）一個數(shù)（0除外）除以小數(shù)，商一定比這個數(shù)大。（）（10）兩個數(shù)相除的商是0.9，被除數(shù)不變，除數(shù)擴(kuò)大10倍，商是9.（）5、把下列各式中的乘積點上小數(shù)點，使等式成立。9.36×2.7=252720.89×6.43=5722726.15×3.4=889152.1×1.98=1031584.5×0.07=5÷0.25=6.3÷0.09=2.5×3.6=19.8÷3.3=2.8×4.58=0.76÷0.4=2.36×0.22=3.57÷4.2=382.5÷45=7.23×1.2=21.98×2.31=920÷40=82.8÷36=6.4×5.48=45×2.46=13.42×4.73=2.14×8.3=29.13×3.14=960÷40=3.6÷0.24=9.65×8.12=\4.9×1.12=9.88×11.21=79×97=6.3×12=0.24×28.37=780÷60=28×32＝54×25＝326×52=0.828÷368.61÷2.158.9÷3148×61＝45×12＝23×37=46×58=33×12=32×69=97.2÷2458.75÷0.257.67÷5.97.65÷0.8512.6÷0.28220.3÷0.758.8÷0.2883.2÷3.297.2÷5.48.4÷2418÷482.525÷251.56÷2.4=42.84÷723÷1847.65÷250.98÷3584÷56140.7÷382.898÷0.18=67.5÷152.8÷721.44÷0.015=85.44÷16101.7÷9230.4÷621.24÷360.736÷2343.5÷1285.44÷16230.4÷635.21÷742.84÷739.6÷246.21÷0.03101.7÷967.5÷1521.24÷360.736÷2343.5÷1235.21÷739.6÷246.21÷0.03210÷1.451.3÷0.2791.2÷3.80.756÷0.180.66÷0.311.97÷1.50.828÷368.61÷2.158.9÷318.4÷2469.6÷2.938.4÷0.87.65÷0.85220.3÷0.783.2÷3.215÷0.0697.2÷2412.6÷0.2858.75÷0.2558.8÷0.287.67÷5.997.2÷5.418÷4823÷1847.65÷250.98÷351.56÷2.4=42.84÷721.24÷3639.6÷242.525÷2584÷561.44÷0.015=101.7÷9140.7÷382.8÷7285.44÷16230.4÷635.21÷742.84÷72.898÷0.18=67.5÷150.736÷2343.5÷126.21÷0.0385.44÷16101.7÷967.5÷1543.5÷12210÷1.40.66÷0.3230.4÷621.24÷360.736÷236.21÷0.030.756÷0.1838.4÷0.835.21÷739.6÷2451.3÷0.2711.97÷1.591.2÷3.869.6÷2.915÷0.061.44÷0.015=2.898÷0.18=1.44÷0.015=7.21÷7=600÷50=2.898÷0.18=0.328÷8=3.51÷3=23÷25=3.64÷14=84×0.25=37.8÷28=42×0.16=0.36×0.9=2.4÷3=1.35÷27=5.62×2.4=0.41×2.01=20×0.5=0.8×6=1000×0.09=8.5×0.54=58×0.32=0.28×0.16=0.63×0.12=1.08×52=1.06×0.82=3.5×2.010.06×0.75=1.26÷0.84=5.9×101-5.91.45×6.5+0.55×6.56.12×99+6.128÷（）=0.825.8÷（）=0.258452÷()=45.270÷()=0.76.54×1.04=0.522÷0.18=0.6÷0.015=800.9÷()=80.09360÷()=0.3633÷7.5=10÷0.8=0.532÷0.4=8.01÷0.9=0.456÷1.5=20.1-6.9=0.05÷0.025=0.51÷0.85=0.21÷0.012=3.6÷4.8=25.2÷63=5.7+4.33=6.3÷0.42=16.43+3.6=0.65+19.5=21.5-20.83=0.29×3.18（保兩）4.48÷2.8+1.535.4-9.6÷（2.65-1.05）6.3×【（0.9+1.8）÷4.5】以下簡便運(yùn)算12.5×32×0.2529.4+1.72+3.565.17-1.8-3.213.75-（3.75-6.48）36.59-（6.59+7.3）0.312×12=3.45+7.7+16.55+1.37.23+6.84-0.84+2.7721.63-（8.5+9.63）42×0.16=84×0.25=58×0.32=1.08×52=2871÷0.33=3.1×4.05=54×0.47=420×3.5=9.3÷100×1000=50-16.66=6×0.73=3.82×0.45=0.522÷0.18=7.54÷0.26=91.2÷0.024=1、用豎式計算0.396÷1.2=0.756÷0.36=16.9÷0.13=5.2×0.67.15×22=1.55÷3.9=8.4×1.3=90.75÷3.3=3.68×0.25=13.76×0.8=6.4×2.5=3.7×0.016=13.95÷3.1=4.6×0.6=4.48×4.4=5.25×15=35.4×4.2=0.45×0.73=0.042×0.54=0.43×0.28=0.76×0.320.25×0.046=2.52×3.4=1.08×25=0.12×0.5×0.16＝（保留兩位小數(shù)）3.25×9.04=（用除法驗算）4.8×0.25＝0.125×1.4≈10.75÷12.5=（用乘法驗算）2.5÷0.7=（保留三位小數(shù)）10.1÷3.3=（商用循環(huán)小數(shù)表示）8.9×0.05=3.08×0.43=1.5×26.7=5.22÷29=18.72÷3.6=5.2×0.9＋0.9=2.5×7.1×4=16.12×99＋16.12=7.28×99+7.28=4.3×50×0.2=64－2.64×0.5=23.94+34.3×0.2=2.7×5.4×3.9=6×15.7＋15.7×24=1.2×(9.6÷2.4)÷4.8=3.6×9.85-5.6=(2.275＋0.625)×0.28=8.9×1.1×4.7=8.05×3.4+7.6=6.58×4.5×0.9=2.8×0.5+1.58=4.85+0.35÷1.4=8.7×17.4-8.7×7.4=(1.25－0.125)×8=32＋4.9－0.9=4.8－4.8×0.5=4.8×100.1=56.5×99＋56.5=12.5×0.4×2.5×8=9.5×101=7.09×10.8－0.8×7.09=0.87×3.16+4.64=2．13.×0.×8257=0.68÷（5.2-3.5）×1.25=40.5÷0.81×0.18=4.8×（15÷2.4）=4.4×0.8－3.4×0.8=4．2.×1.＋1.×1.75=6.81+6.81×99=0.25×185×40=(9.37+9．37+9．37+9．37)×2．5=2.37×6.3+2.37×3.7=2.5×1.25×0.32=3.8×10.1=2.5×(3.8×0.04=)0.25×39+0.25=7.69×101=3.8×10.1=0.125×72=14.7÷0.07=46×0.33+54×0.33=(8×5.27)×1.25=3.75÷0.125–2.75=1.2×1.4＝6.81+6.81×99=0.25×185×40=1.53+23.4÷7.2=6.8×0.75÷0.5=13.5×0.98=12.5×8.8=9.5×99=0.37×8.4＝3.14×2.8＝0.15×2.34＝0.85×1.12＝26.37÷31＝7.2÷2.1＝0.86×5.4＝1560÷35＝3.87÷7＝40÷14＝4.8÷2.3＝146.4÷13＝45.5÷38＝1.55÷3.9＝0.382×0.13＝5.63÷6.1＝2.84×0.03＝2.52×3.4=2.84×0.03＝26.37÷31＝32÷42＝4.8÷23＝0.382×0.13＝4.2÷4.5＝1.08×55=0.12×0.44=0.24×2.15=0.25×0.046=26.55÷59=6.03×0.25=117÷18=2.93－1.837=9.48＋1.36=3.568÷16=36.9÷18=四、單位換算（12%）0.24米=（）厘米0.09噸=（）千克8.54平方分米=（）平方厘米3.64千米=（）米140平方厘米=（）平方分米785米=（）千米23分米=（）米60克=（）千克2.06千克=（）克3元4角=（）元15厘米＝（）米7噸60千克=（）噸五、脫式計算（能簡算的要用簡便方法計算）（24%）15.89＋(6.75－5.89)5.17－1.8－3.213.75－(6.48＋3.75)3.68＋7.56－2.687.85-（2.34－0.15）35.6－1.8－15.6－7.213.35－4.68＋2.65-5.3273.8－1.64－13.8－5.365.4÷0.15=2、脫式計算（能簡算的要簡算）。0.125×0.25×8×47.4×0.28+0.28×2.623.4÷5.85=4.8×0.9+0.48（4－0.4）×2.50.544÷0.025=2、脫式計算（能簡算的要簡算）0.125×320.25×0.0610.32÷20.78×1013.26×5.7－32.6×0.070.125×0.40.64×0.7514.5×0.2810.32÷2.412.8÷437.8÷93.25÷2.565÷525.46÷1.30.465÷0.159÷0.180.784÷0.561.8÷2011.2÷0.057÷0.567.3÷0.250.798÷0.389.8÷1.42.52÷2.431÷2560÷4.813÷2072.8÷0.80.092÷23176÷250.315÷1.572.8÷80.315÷0.152.08÷2696÷6411.4÷0.247.56÷4.236÷4896÷0.641.2×1.4＝0.37×8.4＝3.14×2.8＝0.85×1.120.86×5.4＝45.5÷38＝0.15×2.34＝1560÷35＝40÷14＝4.8÷2.3＝146.4÷13＝26.37÷311.55÷3.9＝7.2÷2.1＝3.87÷7＝5.63÷6.12.84×0.03＝0.38×0.13＝26.37÷31＝32÷422.84×0.03＝4.8÷23＝0.382×0.13＝4.2÷4.5＝1.64＋2.35=0.58×250=8.65－6.31=12.5＋3.6=926×0.15=23×7.06=28.448÷14=10－7.64=8÷500=10.88÷34=1.8