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用绳量井深,把生的一端放入井底,井外余8米;把绳对折后再用同样的方法量,井外余1米,井深多少米

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三姑四婆 幼苗

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对折后余1米,说明余了2个1米,所以
1×2=2米
(8-2)/(2-1)=6米 ……进深

1年前

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