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读本刊1984年第4期《试谈数学中的口诀教学》(以下简称《口诀教学》)一文后,觉得该文提出的几段口诀,并不象作者所说的那样“易学”,“难忘”,倒是违背了作者的意愿,削弱了学生的理解记忆,给他们增加了机械背诵的负担。笔者认为,这样做,对培养学生的能力不利,这样的口诀教学是值得商榷的。 1、《口诀教学》用“一提、二添、三变、四简”四个层次,七十个字组成的十句口诀来归纳二次函数式的配方。其实,二次函数式的配方法,在一元二次方程的解法中,就已提到过。不难看出,将ax~2+bx+c=0
After reading the article “On the teaching of oral medicine in mathematics” (hereinafter referred to as “teaching in oral school”) in 1984, I felt that the passages proposed in the article were not as “easy to learn” as the author said. “ Unforgettable, it is contrary to the author’s wishes, weakening the students’ memory of understanding and giving them a mechanical burden of memorizing. The author believes that doing so is not conducive to training students’ abilities. Such oral teaching is worthy of deliberation. 1. ”Tourism teaching“ uses the four levels of ”one mention, two additions, three changes, and four briefs" and seventy words to compose quadratic formulas. In fact, the quadratic functional formulation has been mentioned in the solution of the quadratic equation. It is not difficult to see that the ax~2+bx+c=0