设A,B为正定阵,则()
A.AB,A+B都正定
B.AB正定,A+B非正定
C.AB非正定,A+B正定
D.AB不一定正定,A+B正定
正确答案是D
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Every student should regularly experience the “Aha!”——when something you never understood, or something you never knew was a mystery, becomes clear.( )