来自李崇贵的问题
【用5个完全一样的正方体拼成一个长方体,表面积减少12平方厘米,这个长方体的表面积是多少平方厘米】
用5个完全一样的正方体拼成一个长方体,表面积减少12平方厘米,这个长方体的表面积是多少平方厘米
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2020-05-24 13:59
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牛北方
拼了4次,减少了8个面.一个面：12÷（4×2）=1.5（平方厘米）
五个正方体应有5×6=30个面,但减少了8个,所以只有30-8=22个
用22×1.5=33(平方厘米）
2020-05-24 14:04:45
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