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第一单元练习题14.56×0.4×2.512.5×32×0.2512.5×2.7×0.82.5×3212.5×5625×0.3612.5×8.899×0.353.7×1.8－2.7×1.895.7×0.28＋6.3×0.28－0.28×21.08×9＋1.08下面各题用两种方法简算。12.5×8812.5×880.25×480.25×4812.5×8812.5×8825×480.25×4848×0.56＋44×0.480.279×343＋0.657×2790.264×519＋264×0.4819.16×1.53－0.053×91.699.99×0.8＋11.11×2.8314×0.043＋3.14×7.2－31.4×0.155×1.03×0.232×1.250.45×9953×10.14.2×6.51＋3.49×4.29.99×2.22＋3.33×3.340.125×9612.5×10.8（20－4）×0.2545×21－50×2.145×1.58＋5.5×15.825×7.3×0.4一、列竖式计算.0.26×73.105×1863.08×2511.4×190.59×44.3×280.08×125二、口算0.8×25=7.4×100=0.7×5=0.9×11=0.96×0=0.02×500=12.5×8=0.3×10=1.4×3=1.12×2=0.39×10=4.1×6=1.9×8=三、根据28×65=1820，直接写出下面各题的积0.28×65=28×6.5=28×0.65=2.8×6.5=0.28×0.65=2.8×0.65=四、根据56×125=7000，写出下面各题的积。0.56×125=5.6×1.25=560×12.5=5600×0.125=
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