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(实对称矩阵A的秩等于r，又它有m个正特征值，则它的符号差为()

高老师2年前 (2024-04-30)线性代数（经管类）(04184)9

(实对称矩阵A的秩等于r，又它有m个正特征值，则它的符号差为()

A.r

B.m-r

C.2m-r

D.r-m

正确答案是C

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