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按規律數: 1、由一個圖形構成的,有1,2,3,4,5--》共5個; 2、由兩個圖形構成的,有0個; 3、由三個圖形構成的,有1,2,3,4,5--》共5個; 4、由四個圖形構成的,有0個; 5、由五個圖形構成的,有0個; 6、有6個圖形構成的,有0個; 7、由.別看了,一共就6部分. 所以一共10個三角形.
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