（1）3.2×0.21.4×0.43.3÷31.2÷0.3
（2）2.5×0.41.5×20.7×7 7.3+0.3
（3）0.53-0.31.8×0.50.9×0.010.23×3
（4）0.56÷81.23×31.6÷0.047.3+2.7
（5）2-1.27.8÷68.4÷0.218.4÷0.7
（6）5.6+3.69-2.350.56÷81.23×3
（7）5.6÷0.44.5÷0.98.1×290÷3
（8）1.23+35.6+1.234.5×25.6÷1.4
（9）4.8÷1.27.2÷0.96.6÷1.17.2÷6
（10）2.1÷30.6×0.53.23×21.8÷3
（11）12.5÷0.10.32÷0.81.6+3.70.45×0.2
（12）0.36÷1.80.4×0.58.4+5.68.4÷2.1
（13）4.8÷0.084.8÷0.83+2.39.3÷3
（14）0.01×87.31×1000.09×60.8×0.6
（15）1.25×83÷52.3+2.36.23+3.6．解：口算
（1）3.2×0.2=0.641.4×0.4=0.563.3÷3=1.1 1.2÷0.3=4
（2）2.5×0.4=1 1.5×2=3 0.7×7=4.9 7.3+0.3=7.6
（3）0.53-0.3=0.231.8×0.5=0.90.9×0.01=0.0090.23×3=0.69
（4）0.56÷8=0.07 1.23×3=3.691.6÷0.04=407.3+2.7=10
（5）2-1.2=0.8 7.8÷6=1.38.4÷0.21=40 8.4÷0.7=12
（6）5.6+3.6=9.29-2.35=6.650.56÷8=0.071.23×3=3.69
（7）5.6÷0.4=14 4.5÷0.9=5 8.1×2=16.290÷3=30
（8）1.23+3=4.23 5.6+1.23=6.834.5×2=9 5.6÷1.4=4
（9）4.8÷1.2=4 7.2÷0.9=8 6.6÷1.1=6 7.2÷6=1.2
（10）2.1÷3=0.7 0.6×0.5=0.33.23×2=6.461.8÷3=0.6
（11）12.5÷0.1=125 0.32÷0.8=0.41.6+3.7=5.30.45×0.2=0.09
（12）0.36÷1.8=0.2 0.4×0.5=0.28.4+5.6=14 8.4÷2.1=4
（13）4.8÷0.08=60 4.8÷0.8=63+2.3=5.3 9.3÷3=3.1
（14）0.01×8=0.08 7.31×100=7310.09×6=0.540.8×0.6=0.48
（15）1.25×8=10 3÷5=0.62.3+2.3=4.6 6.23+3.6=9.83．
分析：直接根据小数四则运算的法则进行计算．
点评：此题主要考查小数四则运算的口算能力．