设D=|aij|，(i，j=1，2，3)且，，则a12的代数余子式是 (A)M12

单项选择题

设D=|a_ij|，(i，j=1，2，3)且，，则a₁₂的代数余子式是
(A)M₁₂ (B)A₁₂ (C)M₁₂，A₁₂ (D)M₁₂，A₁₂都不是

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