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整数乘法运算定律推广到小数乘法练习,1、口算(直接写出得数)。,(1)0.50.2= (2)500.2= (3) 5000.2=,(4)2.44= (5)2.50.4= (6)0.2540=,(7)0.1258= (8)12.58= (9)1.2580=,0.1,1,100,9.6,10,10,1,100,100,2、拆数。,(1)32=4( ) (2)1.02=( ) ( ),(3)0.99=( ) ( ) (4)9.8=( ) ( ),用简便方法计算下面各题: 500.130.2 0.254.784 2.330.54 2.5320.125,10.81110.8 0.87299+0.872 1.5103 2.39.9 0.678.32.70.670.67,怎样简便就怎样算:,(9.7250.275)0.59 33.22.640.5 0.2799,12.532 8714.7+8715.3,课堂作业,0.25321.25 1980.61 7.63.2+7.66.8 (10+0.2)2.5,