问题
解答题
下列由四舍五入法得到的近似数，各精确到哪一位，各有几个有效数字？
（1）0.12；
（2）0.05；
（3）0.1020；
（4）32.7
答案
解：（1）精确到百分位，有2个有效数字；
（2）精确到百分位，有1个有效数字；
（3）精确到万分位，有4个有效数字；
（4）精确到十分位，有3个有效数字。
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下列由四舍五入法得到的近似数，各精确到哪一位，各有几个有效数字？
（1）0.12；
（2）0.05；
（3）0.1020；
（4）32.7
解：（1）精确到百分位，有2个有效数字；
（2）精确到百分位，有1个有效数字；
（3）精确到万分位，有4个有效数字；
（4）精确到十分位，有3个有效数字。
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