Option 25 DHS 1.1 Collection of DHS Ryabushko

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DHS - 1.1
No. 1.25. For this determinant find the minors and algebraic additions.
Calculate the determinant: a) spreading it over the elements i of the string; b) spreading it into j column elements; c) having previously received zeros in the i line. i = 2; j = 3.
No. 2.25. Two matrices A and B are given. Find: a) AB; b) BA; c) A – 1; d) AA – 1; e) A – 1A.

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