12根火柴杆围成面积为8的长方形, 你能移动5根, 使得面积减少50%吗?
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我觉得题目不是很清楚,我移动两根不就行了吗?为什么要5根?还是一定要用全所有的12根? | | |__ __| | | | |
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make it two rectangles, one horizonal 1*2 and one vertical 1*2. |
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