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课上讲解这样一道题:毛毛用一根1米长的铁丝围了一个三角形,量得三角形的一边是1/4米,另一边是3/8米。第三条边长是多少米?这是一个什么三角形?一生板书:1-1/4-3/8=3/8(米),答:第三条边长是3/8米,这是一个等腰三角形。师:同意吗?生:我认为应该补上3/8=3/8这一比较的过程,说明有两条边相等。师:不错,现在可以得满分了吗?生(众):可以。
Class to explain such a question in class: plush surrounded by a 1-meter-long iron wire a triangle, measured the side of the triangle is 1/4 meter, the other side is 3/8 meters. The third side length is how many meters? What is a triangle? Life plank: 1-1 / 4-3 / 8 = 3/8 (m), A: The third side length is 3/8 meters, which is An isosceles triangle. Teacher: Agree? Health: I think we should make a comparison of 3/8 = 3/8 of this comparison process, indicating that there are two sides equal. Teacher: Yes, now you can get a perfect score? Health (public): Yes.