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在小学数学教学中,常常碰到几何题。一些小学生在解答几何题时经常发生错误。如小学生在解答“一个等腰三角形的底角是45度,顶角是( )度,这个三角形是( )三角形。”这道题中,有以下几种不完整的答案:(1)这个三角形是(等腰)三角形;(2)这个三角形是(直角)三角形。经过了解,发现他们产生错误的原因并不是不懂题意,除了概念不清以外,还有不画图,或即使画了图,也没有按题意把图画准的原因。如把该题中的三角形画成:
In primary school mathematics teaching, often encounter geometric problems. Some pupils often make mistakes when it comes to solving geometry problems. If the pupil answers “The angle of the bottom of an isosceles triangle is 45 degrees and the apex angle is (degrees), this triangle is a triangle.” There are several incomplete answers in this question: (1) This triangle Is (isosceles) triangle; (2) this triangle is (right angle) triangle. After understanding and found that they did not understand the reasons for the error, in addition to unclear concepts, there is no drawing, or even drawing the picture, nor according to the subject of the standard picture. If the problem in the triangle is drawn as: