A ' al ; ( 2 )矩阵 A 可逆的充要条件为 detA 0 ; ( 3 )若矩阵 A 可逆,则 detal + 0 ,且 detA - 1 ( deta ) , ( Al ) = A , ( aA ) = alar ( a 0 ) , ( AT ) == ( A ) ...
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