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一、能明显体现两步应用题的中间问题两步应用题的教学重点是正确提出中间问题,难点是题中只有两个条件,某个条件需重复使用。教学时若能根据题意写出数量关系式,那么,隐蔽在题中的中间问题就显露出来。如: 例1 李老师买篮球用15元,买足球比买篮球少用8元,买篮球和足球一共用多少元。写式:买篮球钱数(15元)+买足球钱数(?元)=共同钱数可见,中间问题为买足球的钱是多少元,这样尽管“15元”的条件要重复使用,解题也不容易出现错误。
First, can clearly reflect the two-step application of the intermediate problem Two-step application of the teaching emphasis is to correctly put forward the middle of the problem is that the problem is only two conditions, a condition to be reused. If teaching can be written according to the number of questions, then the hidden problems in the middle of the problem will be revealed. Such as: Example 1 Teacher Li to buy basketball with 15 yuan, buy football less than buy basketball 8 yuan, buy basketball and football a total of how many dollars. Write: buy basketball money (15) + buy football money (?) = Common money can be seen, the middle question is how many dollars to buy football, so despite the “15 yuan” conditions to be reused, the solution Problem is not prone to error.