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在小学数学教学中,对彼此有密切联系或容易混淆的概念、法则、公式,进行适当的对照、比较,有利于揭示本质,分析异同,使学生掌握得牢固、正确。下面简介几种常用的对比方法。一、相似对比有些公式的形状很相似,如:S_△=ah+2,S_(?)=ah;C_圆=2πr,S_圆=πr~2;V_(圆柱)=Sh;V_(圆锥)=1/3Sh;等等。学生运用这些公式时,常因一字之
In the elementary mathematics teaching, the proper comparison and comparison of the concepts, rules and formulas that are closely related or confused with each other are beneficial to reveal the essence, analyze the similarities and differences, and enable the students to grasp firmly and correctly. Here are some common methods of comparison. A similar comparison Some of the shape of the formula is very similar, such as: S_ △ = ah +2, S_ (?) = Ah; C_ circle = 2πr, S_ circle = πr ~ 2; V_ (cylinder) = Sh; V_ Cone) = 1 / 3Sh; and so on. Students use these formulas, often because of the word