第一天之后剩下：5*（1-1/5）=4吨
第二天烧了：4*（1/5）=0.8吨
剩下：4-0.8=3.2吨
一堆煤有5吨,第一天烧了5分之1吨,第2天烧了余下的5分之1,第2天烧了多少吨?还还剩多少吨?
一堆煤有5吨,第一天烧了5分之1吨,第2天烧了余下的5分之1,第2天烧了多少吨?还还剩多少吨?
数学人气：784 ℃时间：2019-10-23 04:20:29
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