用绳子测一口井深,将绳三折去量,井口外多余三米,将绳四折去量,井口外还余一米,井深几米?绳长几米?
人气：191 ℃ 时间：2019-11-07 20:16:55
解答
第一次:设井深X米,那么绳子就是3X+3米
第而次:设井深X米,那么绳子就是4X+1米
所以3X+3=4X+1
解得:井深2米,绳子长9米
对不对啊?
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