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因為A^2-2A+2E=0, 所以A(A-2E)= -2E 所以A可逆,且A^-1 = -1/2(A-2E). 再由A^2-2A+2E=0 A(A-3E)+(A-3E)+5E = 0 所以(A+E)(A-3E)= -5E 所以A-3E可逆,且(A-3E)^-1 = -1/5(A+E).
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