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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:1.381.20.5 2.53.790.41.381.20.5 2.53.790.4253.21.25 8.74.7+5.38.7253.21.25 8.74.7+5.38.7 2.80.5-1.80.5 2.80.5-1.80.5 (8+0.88+0.8)1.251.253.899+3.8 2.54101-2.543.899+3.8 2.54101-2.54 0.2899 5.341020.2899 5.34102 用简便方法计算下面各题:用简便方法计算下面各题:5.7540.5 12.58.240.85.7540.5 12.58.240.80.253212.5 5.62.3+2.34.40.253212.5 5.62.3+2.34.4 10.72.53-0.72.53 10.72.53-0.72.53(4-0.44-0.4)2.52.58.6799+8.67 0.524101-0.5248.6799+8.67 0.524101-0.524 2.3898 1022.52.3898 1022.5