发布网友 发布时间:2024-10-24 11:20
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热心网友 时间:2024-11-06 01:20
设楼高h米,下落共需时间t秒。h = gt^2/216h/25 = g(t-1)^2/225 / 16 = t^2 / (t-1)^225(t-1)^2 = 16t^25(t-1) = 4tt = 5 秒h = 25 米