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小学生习惯于按事物发生的顺序来思考,比如在公式、运算法则、运算定律等的应用中总是习惯于正向套用,一旦需要逆向应用时便感到困难。鉴于此,结合某些教学内容,训练学生的逆向思维显得十分必要。下面几道应用题,有利于训练学生的逆向思维。例1 某工程队用三天时间修一条公路,第一天修了全长的1/3,第二天修了余下的2/5,第三天修了1200米,这条公路长多少米?
Pupils are accustomed to thinking in the order in which things occur. For example, in applications such as formulas, algorithms, and arithmetic laws, they are always accustomed to applying positively, and once they have to be reversely applied, they feel difficult. In view of this, combined with some teaching content, training students to reverse thinking is very necessary. The following few questions, is conducive to training students in reverse thinking. Example 1 An engineering team repaired a highway with three days, the first day repaired the full length of 1/3, the next day repaired the remaining 2/5, the third day of repair 1200 meters, how many meters the road length?