用绳测井深,把绳三折来量,井外余2米；把绳四折来两,离井口还差1米,井深（ ）米,绳长（ ）米.
人气：292 ℃ 时间：2019-12-04 10:47:55
解答
设绳长 x 米,则井深 3x+2 米或 4x-1 米；
可列方程：3x+2 = 4x-1 ,
解得：x = 3 ,可得：3x+2 = 11 ,
即有：井深（11）米,绳长（3）米.
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