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統計: A(12), B(38), C(213), D(13), E(0) #296460
統計: A(12), B(38), C(213), D(13), E(0) #296460
詳解 (共 1 筆)
#979488
重心( (0+2+7)/3 , (0+7-1)/3 )
=(3,2)
4
0