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人教版(2012年6月第1版)七年级上册数学教材对近似数这一节删去了有效数字的内容,降低了学习难度,目的是让学生更易于掌握近似数的知识,但在实际教学中所出现的习题与考题中都考查到了对近似数内容的灵活应用,使学生感觉到能听懂却不能独立准确地解答题目,鉴于此,拟从以下几个方面对近似数题型的解法加以阐述:1求近似数对应准确值的取值范围一般来说,把一个数精确到哪一位,可以表示出误差绝对值的大小.如,一个近似数精确到十位,说明结果与实际数相差不大于5,依次类推,一个近似数精确
PEP (June 2012 1st edition) Volume 7 upper mathematics textbook for the approximate number of this section by deleting the effective figures, reducing the difficulty of learning, the purpose is to make it easier for students to grasp the approximate number of knowledge, but in The actual teaching problems and exam questions are found in the approximate number of flexible application of the content so that students feel able to understand but can not independently and accurately answer the title, in view of this, the following aspects of the approximate number of questions Solution: 1 find the approximate value corresponding to the range of accurate value In general, the number of a precise number can be expressed in the absolute value of the size of the error. For example, an approximate number of accurate to ten, indicating the results And the actual number of not more than 5, and so on, an approximate number of precision