已知二阶方阵A的特征值为λ1=2,λ2=-1,则|A2|=__________。

已知二阶方阵A的特征值为λ1=2,λ2=-1,则|A2|=__________。

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The Cooperative Principle was proposed by

The Cooperative Principle was proposed byA. Saussur B. Hallida C. Searl D. Gric

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