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平地上有100棵树，高度从最低3米到最高l0米不等，且任意两棵树之间的距离都不超过它们高度差的50倍。现在要用篱笆将它们全部围起来，在不知道树木位置的情况下，至少要准备多少米的篱笆才能确保完成任务（）...
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植树节某班20名同学在一段直线公路一侧植树每人植一棵相邻两棵树相距l0米开始时需将树苗集中放置在某一
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