2019年北师大版五年级下册数学教案:《露在外面的面》

2019-09-24 17:33:00来源:网络

  例2:如图是用8个小正方体拼成的,如果拿走其中的一个,它的表面积会发生变化吗?

  

\

  答:同样都是24个面,不会发生变化。

  练习:将4个棱长为6cm的正 方体拼成一个长方体,长方体的表面积与原来的4个正方体的表面积之和相比,会发生变化吗?变化了多少?

  

\

  36x6=216(平方厘米)

  答:会发生变化,变化了216平方厘米。

  四、课堂小结

  五、拓展延伸

  1、有5个棱长为40cm的正方体放在墙角处。有几个面露在外面,露在外面的面积共有多少平方厘米?

  

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U3dFobuEkOdTac0vA3R6Ll8vteV8PSGnozL5pZaXEX0AmX79vmQdbAUQ8nwqrfmPGaCj+IS8DJX3+WXFnb19VhGUn5CXwYk+v8zNy3p7u6+/bwUfIeQ4nJ7qI4ScDspPSEOh/IQ0FMpPSEOh/IQ0FMpPSEOh/IQ0FMpPSEOh/IQ0FMpPSEOh/IQ0lP8BMWJVuH+T1FAAAAAASUVORK5CYII=" width="300" height="194"/>

  40×40×10=16000(平方厘米)

  答:有10个面露在外面,露在外面的面积是16000平方厘米。

  以上是《2019年北师大版五年级下册数学教案:<露在外面的面>》的内容,更多北师大版五年级下册小学教学教案请关注新东方在线小学网。


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