A = 1 x 1x 1 y1 y 1B=0 0 00 1 00 0 2由题意, A,B的特征值相同显然B的特征值为0,1,2所以 |A| = -(x-y)^2 = 0, 故 x=y.再由 |A-E| = 2x^2 = 0 得 x=y=0
