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小学数学中,有一部分题目,如按常规方法解答,则很难求解;若能打破常规,先将题中的某些条件设为具体数据(所设数据要便于计算)或简单实例,便可从中发现解题规律,使问题化难为易。例1:在一个减法算式中,被减数、减数和差三个数的和是20,6,求被减数是多少?【分析】先任意设一个减法算式,如:10-7=3。再将三个数相加得10+7+3=20,20
Primary school mathematics, there are some topics, such as the conventional method to answer, it is difficult to solve; if you can break the routine, the first question of certain conditions for the specific data (the data set to facilitate the calculation) or a simple example, then From which we can find a solution to the problem and make the problem easy. Example 1: In a subtraction formula, the sum of the number of subtractions, subtractions and differences is 20,6, what is the subtraction? [Analysis] First set a random subtraction formula, such as: 10-7 = 3. Then add the three numbers 10 +7 +3 = 20,20