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近似数在日常生活中,工作中有着广泛应用,因此要认真学好近似数,这里首先要理解和掌握近似数的有关概念.举例如下:一、求精确度一个数的近似数,四舍五入到哪一位,或者说末一个数字在哪一位,就说这个数的近似数精确到哪一位,请看下面求精确度的两种方法1.直接说出精确度例1下面各数的近似数,请说出它的精确度①0.0158≈O.016(②1.804≈1.80解:①精确到千分位(或精确到0.001)②精确到百分位(或精确到0.01)2.由科学记数法读出精确度当近似数是用科学记数法表示时,判断精确度时要
Approximation in daily life, work has a wide range of applications, so to study the approximate number, we must first understand and grasp the concept of approximation. For example as follows: First, find the accuracy of a number of approximation, rounded to what Bit, or the last digit in which one, say that the approximate number of this exact one, look at the following two methods of precision 1. Directly say the accuracy of Example 1 below the approximate number of each , Please say its accuracy ① 0.0158 ≈ 0.016 (② 1.804 ≈ 1.80 solution: ① accurate to the thousandths (or accurate to 0.001) ② accurate to the percentile (or accurate to 0.01) Scientific notation accuracy When the approximate number is expressed in scientific notation, to determine the accuracy of time