论文部分内容阅读
在复习有余数的除法时,我出了这样一道题:127÷(??)=5……2。甲解:(127-2)÷5=125÷5=25。他说:“先把被除数减去余数,再把所得的差,也就是除数与商的积,除以商,就是除数。”甲的思路与回答都可以说是无懈可击,其他同学也都表示同意。我未及细想,正欲进入另一个教学环节,忽然,乙举手说:“用不着像甲计算那么麻烦,只要把被除数直接除以商,取整数部分即可。答案同样是25。”不少人立刻响应,并且对乙另辟蹊径的简单解法十分赞赏,但又说不清为什么可以这样做。我却有种“柳暗花明”的感觉,正想说话,
When reviewing the division with the remainder, I came out with a question like this: 127 ÷ (??) = 5 ... 2. A solution: (127-2) ÷ 5 = 125 ÷ 5 = 25. He said: “First divide the remainder by the remainder, and then divide the difference, that is, the product of the divisor and the quotient, by the quotient, which is the divisor.” “A’s thoughts and answers are impeccable and other students Agree. I did not think about it, trying to get into another teaching session. Suddenly, B raised his hand and said: ”There is no need to worry about calculating the value of A, just divide the dividend directly by the quotient and take the whole number. “Many people respond immediately and appreciate the simple solution to another path, but they can not say why they can. I have a kind of ”Wicked" feeling, just want to speak,