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近几年的中考中,有关科学记数法与有效数字的试题频繁出现,这类试题通常以现代科学技术、环境保护、日常生活中的热点实例为背景材料,或与计算器的使用相结合,具有时代气息和生活气息,使用的数字包含两大类:准确数与近似数.对于一些很大或很小的数,为了方便记录,一般采用科学记数法写成a×10n的形式(其中1≤a<10,n为整数).考点1科学记数法例12009年入秋以来,我国西南地区遭
In the middle school entrance examinations in recent years, questions about the scientific notation and the effective number frequently appear. Such questions are usually based on the background of modern science and technology, environmental protection and hot daily examples, or combined with the use of calculators , With the flavor of the times and life style, the use of digital contains two categories: the exact number and approximate number.For some large or small number, in order to facilitate the record, the general use of scientific notation written a × 10n form 1 ≤ a <10, n is an integer). Test points 1 scientific notation in law in 12009 since the fall, Southwest China was