数学题:一个长方体木块与一个正方体木块刚好可以拼成一个大长方体木块
- 时间:2020-06-09 15:27:22
- 分类:数学世界
- 阅读:125 次
数学题:一个长方体木块与一个正方体木块刚好可以拼成一个大长方体木块,拼成的这个大长方休木块的表面积要比原来两个木块的表面积总和少32平方厘米。原来那个正方体木块的表面积是多少平方厘米?
数学题解答:先要看懂题目,如果看懂了,在头脑中应该形成类似于下图的表象:

拼起来后,减少的表面积,就是红色部分的两个面,因为它们连在一起后,不再露在外面,就不能算做表面积了。
因为减少的面积是32平方厘米,所以每个正方形的面积是:32÷2=16(平方厘米)
而原来的正方体中一共有六个这样的正方形(6个面),所以正方体的表面积就是:16×6=96(平方厘米)
问题得以解决。
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