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the population of snowtown was 4500 in 1990.In 1994,it had decreased to 3600.Find the percent decrease in population during those four years.如果有公式也一起给我,给个详解
人气:454 ℃ 时间:2020-03-21 09:33:01
解答
原意:1990年……的人口是4500人,在1994年则下降到3600.求下降率.
(4500-3600)/4500=20%
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