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在数学练习中,对所得的结果加以检验,是一个必要的步骤,否则就不能确信计算的结果一定准确。在应用数学计算解决实际问题时,为了保证结果的准确,检验更是不可缺少的过程。因此,我们在数学教学中必须教会学生检验的方法,然后他们才会在实践中加以应用。今把我们平时教给学生的方法写在下面。一、列式后要核对题目所给的条件。检验工作,不是在解题求得结果后才做,而是在列式后就要开始,如果弄错条件,抄错数字,尽管列式合理,所得结果一定不对;等到做完了复看才发现错误,再重新来做,就走了弯路浪费了时间。所以在列式后,随即要做核对题给条件的工作:
It is a necessary step to test the results obtained in mathematics exercises, otherwise we can not be sure that the result of the calculation is accurate. In the application of mathematical calculations to solve practical problems, in order to ensure the accuracy of the results, testing is an indispensable process. Therefore, we must teach students how to test the students in mathematics teaching before they can be applied in practice. Now we usually teach students the way to write below. First, the type to check the conditions given by the title. The inspection work is not done after the result of the problem solving is obtained. Instead, it begins after the formula. If the conditions are wrongly decided, the wrong number will be copied. Although the formula is reasonable, the result will be incorrect. When the review is completed, it will be found Wrong, and then do it again, left the detour wasted time. Therefore, after the formula, then to do the work of checking the conditions to the conditions: