{{2, a, 5, b}, {7, c+d, 9, 11}, {13, 17, 19, 23}, {a-1, -2, b+c, 4}}の(2,3)小行列式{{2, a, 5, b}, {7, c+d, 9, 11}, {13, 17, 19, 23}, {a-1, -2, b+c, 4}}の(2,3)小行列式

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