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1. （解答题）设

A = (\begin{array}{ccc} - 2 & 0 & 0 \\ 0 & 1 & 0 \\ 0 & 0 & 3 \end{array}), B = (\begin{array}{ccc} 1 & 0 & 1 \\ 0 & - 2 & - 1 \\ 0 & 0 & 3 \end{array}), C = (\begin{array}{ccc} 1 & 0 & 0 \\ 0 & - 1 & 2 \\ 0 & 2 & 2 \end{array}),

问

A, B, C

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