|A| = 2k-15
所以,当 k ≠ 15/2 时 A 可逆a,b取何值时,矩阵A=[a -bba]可逆?此时,矩阵A的逆矩阵是什么a^2+b^2 ≠ 0 时.A^-1 = [1/(a^2+b^2)]*ab-ba
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