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数学
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用绳测井深,把绳三折,井外余2米,把绳四折,还差1米不到井口,那么井深多少米?绳长多少米?
人气:399 ℃ 时间:2020-05-08 17:31:11
解答
(3×2+4×1)÷(4-3)
=(6+4)÷1
=10÷1
=10(米)
(10+2)×3=36(米).
答:井深10米,绳长36米.
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