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列方程解应用题时,由于所设的未知数(一般用x表示)参加了列式,使逆向思维的问题转化成顺向思维的问题,学生易于接受。教学时要抓好解题的两种思路,三项训练,两个检查,一个提高。一、两种思路两种思路是:填补代换法思路和分析推理法思路。填补代换法的思路是先根据题意写出文字等量关系式,再用具体数或字母填换文字数量,列出方程。例如,商店原来有74千克水果糖,又运来25千克,卖了一天以后,还剩63千克,这一天卖了多少千克?用填补代换法的思路来解题:
When the column equation solution is applied to the question, the unknowns (generally represented by x) in the column formula, so that the problem of reverse thinking into the problem of forward thinking, students are easy to accept. Teaching to grasp the two problems solving the idea of three training, two checks, one to improve. One, two kinds of train of thought Two kinds of train of thought are: Fill replacement train of thought and analysis of reasoning train of thought. The idea of filling the substitution method is to first write the equivalent relationship of the text according to the idea, and then replace the specific number or letter with the number of words to list the equation. For example, the store had 74 kilograms of fruit sugar, and shipped 25 kilograms, sold a day later, left 63 kilograms, how many kilograms sold this day? To fill the idea of substitution method to solve the problem: