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单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,第,3,讲,乘除法巧算,研究目标：,通过本讲的学习，总结归纳乘除法的运算定律性质的灵活运用及巧算的方法，使复杂的乘除法运算变得简便、迅速。让我们一起研究吧！,点击例题,1, 19425,19,（,425,）,19100,1900,125498,（,1258,）,49,100049,49000,1252584,（,1258,）,（,254,）,1000100,100000,2548,25412,25412,10012,1200,练习,1, 145254,145,（,254,）,145100,14500,（,2,）,125198,（,1258,）,19,100019,19000,（,3,）,811125,=,（,8125,）,11,=100011,=11000, ,1612550,8212550,（,1258,）,（,502,）,1000100,100000,1254392548,（,1258,）,（,254,）,439,1000100439,43900000, ,3625,49,25,（,254,）,9,1009,900,12572,12589,（,1258,）,9,10009,9000,2532125,25,48,125,（,254,）,（,8125,）,1001000,100000,点击例题,2,计算下面各题。,125,（,40,8,）,（,12540,）（,1258,）,5000,1000,6000, （,100,4,）,25,（,10025,）（,425,）,2500,100,2400,练习,2, （,40,4,）,25,4025,425,1000,100,1100,125,（,20,8,）,12520,1258,2500,1000,1500,125,（,80,8,）,12580,1258,10000,1000,11000, ,125,（,80,8,）,12580,1258,10000,1000,9000, （,40,8,）,25,4025,825,1000,200,800,2520,4,）,2520,254,500,100,600, （,125,1250,）,8,1258,12508,1000,10000,11000, （,31,5,）,25,3625,9425,9 ,（,425,）,9 100,900,点击例题,3,计算： ,1612,1643,643,192,3924,3946,1566,936,3612,3626,726,432,4425,41125,（,254,）,11,10011,1100,练习,3, 计算。,2924,2946,1166,696,3628,3647,1447,1008,2512,2543,1003,300, 计算。,1514,1527,307,210,3415,3453,1703,510,3615,3653,1803,540, 计算。,400425,1001425,1001,（,425,）,1001100,100100,6635,6657,3307,2310,2445,2459,1209,1080,点击例题,4,用简便方法计算。,92525,（,9254,）,（,254,）,3700100,37,38700900,（,38700100,）,（,900100,）,3879,43, （,350,25,）,5,3505,255,70,5,75,52575,52557,1057,15,练习,4,简便下列各题：,42525,（,4254,）,（,254,）,1700100,17,82525,（,8254,）,（,254,）,3300100,33,364070,（,364010,）,（,7010,）,3647,52,77525,（,7754,）,（,254,）,3100100,31, 简算下列各题：, （,182,325,）,13,18213,32513,14,25,39, （,2046,1059,）,3,20463,10593,682,353,329, 你能迅速算出结果吗,?,（,1,）,340025,（,34004,）,（,254,）,13600100,136,（,2,）,48001240,48004012,12012,10,（,3,）,2275135,2275513,45513,35,点击例题,5,560,（,286,）,560286,206,120,242483,2424,（,83,）,242424,101,364246,364,（,246,）,3644,91,712854,712869,11889,132,练习,5,你能算出结果吗？,8500254,8500,（,254,）,8500100,85,37216254,372,（,16254,）,3723,124,243729,（,8181,）,2437298181,（,24381,）,（,72981,）,39,27, 你会简算吗？,27500425,27500,（,425,）,27500100,275,4032,（,89,）,403289,5049,56,1000001258,100000,（,1258,）,1000001000,100, 简便计算。,720,（,365,）,720365,205,4,783819,78,（,3819,）,782,156,（,3,）,125,（,8050,）,=1258050,=1000050,=200,（,4,）,12858,12885,165,80,完,125,（,20,8,）,12520,1258,2500,1000,3500,
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