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THAOMUYY
b) Cho ma trân vuông A cấp n, biết det (A ^3) = 27. Tính det(A)
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DOTOANNANG
$$\left ( \det A \right )^{3}= \det\left ( A^{3} \right )= 27= 3^{3}\Rightarrow\det A= 3$$
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