Answers:

Det[( {{5, 3}, {1, 2}} )]

MatrixForm[Inverse[( {{5, 3}, {1, 2}} )]]

Det[( {{-2, -3, 0}, {0, -2, -2}, {-2, -3, 3}} )]

Det[( {{-3, 7, -10, -3, -7}, {0, 1, 2, -1, 10}, {0, 0, 2, 8, -10}, {0, 0, 0, -1, 2}, {0, 0, 0, 0, 0}} )]

7

( {{2/7, -3/7}, {-1/7, 5/7}} )

12

0


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