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解决一个问题时,抓住问题的整体,强调从整体出发进行观察、分析、思考,有利于全面把握问题,培养学生的整体观念。例1 计算: 19991999×1997-19971997×1999 分析:许多学生按四则运算顺序先乘后减,计算量大,容易出错。如果从整体看。被减数与减数都是两数之积,其中一个因数相同,可分解出相同因数。解:19991999×1997-19971997×1999 =1999×10001×1997-1997×10001×1999 =0 例2下表所列分数分别是李明同学两门、三门或五门学科的平均成绩,请你把各科成绩算出来。
When solving a problem, we should seize the whole problem and emphasize that we should observe, analyze and think from the whole, which is conducive to comprehensively grasping the problem and cultivating the overall concept of the student. Example 1 Calculation: 19991999 × 1997-19971997 × 1999 Analysis: Many students according to the order of four operations by the first subtraction, a large amount of calculation, error-prone. If you look at the whole. Minus and Minus are the product of two numbers, one of which is the same factor that breaks down the same factor. Solution: 19991999 × 1997-19971997 × 1999 = 1999 × 10001 × 1997-1997 × 10001 × 1999 = 0 Example 2 The scores listed in the table below are the average grades of two, three or five subjects of Li Ming students, please Calculate the results of the subjects.