10 設；當 A 的特徵值（eigenvalues）為  λ1 =4 λ2 = 7 時，a = ? b = ?
(A)a = 11, b = 28
(B)a = 11, b = −28
(C)a = 28, b =11
(D)a = −28, b = 11

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統計： A(0), B(0), C(1), D(2), E(0) #1050229