1. 设集合 $A=\left\{x \mid x^{2}-5 x+6>0\right\}, B=\{x \mid x-1<0\}$, 则 $A \cap B=$
Gaokao · Math · previous-year question
- A.$(-\infty, 1)$correct
- B.$(-2,1)$
- C.$(-3,-1)$
- D.$(3,+\infty)$
Answer
A. $(-\infty, 1)$
Explanation
【详解】由题意得, $A=\{x \mid x 2$, 或 $x 3\}, B=\{x \mid x<1\}$, 则 $A \cap B=\{x \mid x<1\}$. 故选 A.
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