听力原文:Isn't Jane going to file these client folders? (A) I don't know where they are. (B) Yes, the folders are very clean. (C) They're not ready for filing yet. (38)
A.
B.
C.
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举一反三
【简答题】设矩阵M= . 3 2 - 1 2 1 2 3 2 . 的逆矩阵是M -1 = . a b c d . ,则a+c的值为______.