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我们指导学生解应用题,不能仅仅满足于学生能用一般常规方法去解,还要善于指导学生变换思考角度,从隐含关系中发现问题的本质,从而开辟解题捷径,这不仅是解题本身的需要,也是启迪学生智慧、培养学生智力品质的需要,兹举数例,以示一斑: 例1 一个容器内盛纯药液若干,倒出6千克后加同重量的水,又倒出6千克溶液,再加同重量的水,此时容器内的溶液浓度是16％。求这个容器原装纯药液多少?
We guide students to apply the questions, not only satisfied with the students can use ordinary methods to solve, but also good at guiding students to change the perspective of thinking, to find the nature of the problem from the implicit relationship, so as to open up a shortcut to solve problems, this is not only a problem Their own needs are also the need to enlighten students’ wisdom and cultivate their intellectual qualities. Here are some examples to illustrate: Example 1 A container contains several pure liquids. After pouring out 6 kg of water, add the same amount of water and pour it out. 6 kg of solution, plus the same weight of water, the concentration of the solution in the container is 16%. How much is this container of original pure liquid?