( )3.設A﹐B﹐C 皆為二階方陣﹐O 為二階零矩陣﹐判斷下列敘述何者為真﹖ (1)若AB = AC 且A ≠ O﹐則B = C (2)A(BC) = (AB)C (3)若AB = O﹐則A = O 或B = O. (4)若A2 = A ...
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