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| 1. |
A=\left[ \begin{array}{lll}{2} & {-1} & {1} \\ {2} & {-3} & {5}\end{array}\right], B=\left[ \begin{array}{rr}{3} & {-3} \\ {4} & {-1} \\ {5} & {0}\end{array}\right], \text { find } A B |
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