整数乘法运算定律推广到小数乘法练习2

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整数乘法运算定律推广到小数乘法练习整数乘法运算定律推广到小数乘法练习2用简便方法计算下面各题：用简便方法计算下面各题：1.381.381.21.20.5 2.50.5 2.53.793.790.40.425253.23.21.25 8.71.25 8.74.7+5.34.7+5.38.78.7 2.82.80.5-1.80.5-1.80.5 0.5 （8+0.88+0.8）1.251.253.83.899+3.8 2.5499+3.8 2.54101-2.54101-2.54 0.280.2899 5.3499 5.34102102 用简便方法计算下面各题：用简便方法计算下面各题：5.755.754 40.5 12.50.5 12.58.248.240.80.80.250.25323212.5 5.612.5 5.62.3+2.32.3+2.34.44.4 10.710.72.53-0.72.53-0.72.53 2.53（4-0.44-0.4）2.52.58.678.6799+8.67 0.52499+8.67 0.524101-0.524101-0.524 2.382.3898 10298 1022.52.5