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用字母表示数,不是用字母简单地代替数字,而是一个具体数量符号化的过程,是思维的一次飞跃。例如:黄花有9朵,红花比黄花多a朵,红花有多少朵?教学中,我们应当让学生认识到红花的朵数就是(9+a)朵,9+a就可以表示红花的朵数,此时数量的呈现不再是具体的数,而是含有字母的式子,从具体的数到抽象的字母式,表达形式发生了变化,在表达形式发生变化的背后,更意味着思维层次的飞跃。如何让学生实现这一思维的飞跃,正是教学“用字母表示简单数量关系”的关键所在。鉴于此,笔者做了如下一些尝
The number of letters, not a simple replacement of numbers with numbers, but a specific number of symbolic process is a leap in thinking. For example, there are 9 yellow flowers, 1 red yellow flower and 1 red flower. In teaching, we should let students recognize that the number of red flowers is (9 + a), 9 + a can represent red The number of flowers, the number of present is no longer a specific number, but contains the letter of the formula, from the specific number of letters to the abstract, the expression changed, behind the changes in the form of expression Means the level of thinking leap. How to enable students to achieve this leap in thinking, it is the teaching of “a simple relationship between the number of letters,” the key. In view of this, I made the following taste