首页/ 题库 / [单选题]在长581米的道路两侧植树,假设该路段仅的答案

在长581米的道路两侧植树,假设该路段仅两端有路口,要求在道路路口15米范围内最多植1棵树,并且相邻了两棵树间的距离为4米,问最多能值多少棵树?

单选题
2022-01-11 08:26
A、137
B、139
C、278
D、280
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正确答案
D

试题解析
双边植树问题。由于题目要求两边路口15米范围处最多只能种一棵树,所以先排除这两个15米处的范围,看剩下的路段能种多少树:581-30=551。根据种树公式551/4取整得到137,利用种树公式得到551米的范围可以种138棵树,然后剩下两端各可以种一棵树,所以,一条马路可以种140棵树,两边种树则可以种280棵树。所以选D。

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