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中学里用不用有效数字?看法不一,教学中做法也极不相同。本文的观点是:高中物理教学应当使用有效数字。它对培养学生独立分析、解决问题能力甚为重要,是完成物理教学目的所必需。在物理课堂上经常可以听到学生问:“老师,小数点后保留几位?”当老师回答:“小数点后留二位(或三位)”学生便不加思索地去掉多余位数而得出结果。这种办法,表面上顺利易行,但却失去了培养学生独立工作能力的大好时机。因为对一般的计算题来说,有了
There are different views on the use of not-effective figures in secondary schools, and teaching practices are also very different. The point of this paper is that high school physics teaching should use valid figures. It is very important to develop students’ ability to analyze and solve problems independently. It is necessary to complete the purpose of physics teaching. In the physics class, students can often hear the question: “Teacher, how many digits will be kept after the decimal point?” When the teacher replied, “Two or three digits after the decimal point,” the student will figure out the extra digits without thinking. result. This method, on the surface, is smooth and easy, but it has lost the opportunity to train students to work independently. Because for the general calculation problem, with