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精讲多练是提高教学质量的好办法,而一题多变又是精讲多练的一种有效形式。下面举例说明应用题的一题多变。 一、改变已知条件 例1 一个生产队有早稻田400亩,共收稻谷340,000斤,平均亩产多少斤? 这是求平均数问题的最基本的形式。通过启发解答,小结求平均数的基本公式为 总数量÷总份数=平均数如果总数量没有直接告诉我们,则要先求出总数量。因此例1可改变为 例2 一个生产队有早稻田400亩,分两组收割,第一组收稻谷180,000斤,第二组收160,000斤,平均亩产多少斤?
Speaking more practice is a good way to improve the quality of teaching, and a changeable topic is an effective form of talking and practicing. The following examples illustrate the problem of a variety of questions. First, to change the known conditions Example 1 A production team has 400 acres of wilderness rice fields, a total of 340,000 pounds received rice, the average yield per kilogram? This is the most basic form of the average problem. By enlightening the solution, the basic formula for averaging results is the total number ÷ the total number of copies = the average. If the total quantity does not tell us directly, then the total quantity is found first. Therefore, Example 1 can be changed to Example 2 A production team has 400 mu of morning paddy field, divided into two groups, the first group received 180,000 kg of rice, the second group received 160,000 kg, the average yield per kg?