20 19 is the answer to the question 3 2 1 for the postgraduate entrance examination?
20 19 years of mathematics postgraduate entrance examination 32 1 questions are related to matrices. The first question is to find the unknown by matrix equivalence, and the answer is unique. The second question is reversible matrix, and the inverse matrix is unique, so the answer to the question 20 19, Mathematics for Postgraduate Entrance Examination 32 1, is unique.