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【题目】集合M={1,3,a},N={2,a2}MN={1,2,3,4,16},则a的值为

A0 B1 C2 D4

【答案】D

【解析】∵M={1,3,a},N={2,a2},MN={1,2,3,4,16},∴a=4,a2=16或a=16,a2=4,解得a=4

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