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∵方程x2-5x+6=0的解為x1=2,x2=3∴方程x2-5x+6=0解的集合為{2,3}同理可得方程x2-x-2=0解的集合為{-1,2}囙此,集合M={2,3}∪{-1,2}={-1,2,3},共3個元素故選:C
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