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1教学目标(1)从具体情境中通过列式归纳分式的特点,了解分式的概念;(2)经历探究分式有意义的条件的过程,理解分式有意义的条件,有类比意识;(3)会用分式表示简单实际问题中的数量关系,并能解决一些实际问题,体会分式模型思想,体会数学的应用价值。2教学重点和难点(1)分式的概念,分式有意义的条件;(2)对分式概念的理解,例2的教学。
1 teaching objectives (1) from the specific context through the column induction fractional features, to understand the concept of fractional; (2) experience the process of exploring the conditions of fractional meaningful understanding of fractional meaningful conditions, there is a sense of analogy ; (3) It can express the quantitative relations in the simple practical problems by the fractional formula, and can solve some practical problems, understand the idea of fractional model and realize the application value of mathematics. 2 teaching emphasis and difficulties (1) the concept of fractional, fractional meaningful conditions; (2) the understanding of the concept of fractional, Example 2 teaching.