[理工] [工數]-線代
(1)Suppose A屬於R^mxn .If the columns of A all add up a fixe
constant c , then c is a eigenvalue of A .(T)
4 -2 6
(2)A= [ 2 1 3 ]
2 3 -3
sol.
|A-SI| = -s^3 + 2S^2 + 28s - 48 = 0
特徵多項式不可因式分解,A不可對角化(怎樣才算是不可因式分解?有i不行嗎?)
(3)A是3x3矩陣,特徵值是1,2,3
|2(A^T A)|=?
(答案是288,我算出72)
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