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:133 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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