1. 设集合 $M=\{1,3,5,7,9\}, N=\{x \mid 2 x>7\}$, 则 $M \cap N=(\quad)$
Gaokao · Math · previous-year question
- A.$\{7,9\}$
- B.$\{5,7,9\}$correct
- C.$\{3,5,7,9\}$
- D.$\{1,3,5,7,9\}$
Answer
B. $\{5,7,9\}$
Explanation
【详解】 $N=\left(\frac{7}{2},+\infty\right)$, 故 $M \cap N=\{5,7,9\}$, 故选: B.
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