设集合 A={x∣−1<x<3}A = \{x \mid -1 < x < 3\}A={x∣−1<x<3},B={x∣2<x<5}B = \{x \mid 2 < x < 5\}B={x∣2<x<5},则 A∪B=A \cup B =A∪B=