7.一堆煤重2吨,第一天用去这堆煤的$\frac{1}{5}$,第二天用去这堆煤的$\frac{2}{5}$,第三天用去这堆煤的$\frac{1}{5}$,这堆煤用完了吗?如果没用完,还剩下几分之几?
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