乘法分配律是教学中的难点。为了使学生深刻地理解、并能正确、灵活地运用这一定律进行简便计算,我引导学生由浅入深进行下列几个方面的系列训练。 1.直用。例如 402×65 7.25×8 =(400+2)×65 =(6+1.25)×8 The law of multiplicative distribution is a difficult point in teaching. In order to enable students to profoundly understand, and can use this law accurately and flexibly for simple calculations, I guide students from the shallow depth to the following series of series of training. 1. Use it straight. For example 402×65 7.25×8 = (400+2)×65 = (6+1.25)×8