小红在操场上插了根1米高的竹竿

  • 时间:2020-05-16 19:48:28
  • 分类:数学世界
  • 阅读:88 次

下午2点,小红在操场上插了根1米高的竹竿,量得竹竿的影长是0.8米,在同一时刻,小红量得一棵树的影长为2米,你能算出这棵树的实际高度吗?在同一时刻,小华也在操场上插了根3米长的竹竿,你知道这根竹竿的影长吗?

数学题解答:在同一时刻同一地区,物体的长度与影长的比值是一定的,它们成正比例关系。所以:

①解:设这棵树的实际高度是X米。

1:0.8=X:2

算出X=2.5

②解:设竹竿的影长是Y米。

1:0.8=3:Y

算出Y=2.4

问题得以解决。

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