数学教学突破难点七法许万明一、预习法新授课前，教师可结合教材难点，设计思考题让学生预习。如：“石桥区小学买白粉笔８０盒，买的彩色粉笔比白粉笔少３５盒，一共买粉笔多少盒？”教学这道求比一个数少几的数再求和的两步应用题时，应注意题中只出现两个已知数，而其... Breakthrough in Mathematics Teaching Seven Law Xu Wanming First, the pre-study French new teaching, teachers can combine teaching materials, design questions for students to preview. Such as: "Stone Bridge Primary Buy 80 boxes of white chalk, buy less than 35 boxes of white chalk chalk, buy a total of chalk box how many? When it should be noted that only two known numbers appear in the question, and its ...