DHS - 1.1
№ 1.20. To find the determinant of the minors and cofactors.
Calculate the determinant of: a) expanding its line of element i; b) expanding it on
j elements of the post; c) obtaining a pre-zeros in the i line. i = 4; j = 3.
№ 2.20. Given two matrices A and B. Find: a) AB; b) BA; a) A⁻¹; d) AA⁻¹; d) A⁻¹A.

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