用简便方法计算．
6.45×102 0.47×0.5×0.8 0.46×1.9+0.54×1.9
0.027+9.9×0.27 15.8×69.3﹣68.3×15.8 1.25×32×2.5．
用简便方法计算．
6.45×102 0.47×0.5×0.8 0.46×1.9+0.54×1.9
0.027+9.9×0.27 15.8×69.3﹣68.3×15.8 1.25×32×2.5．
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