It's easy to understand by using the number axis. X≤ 1 first, with the opening to the left. Then, the set b is represented on the same axis. Assuming that X in set B is greater than or equal to 5, and the opening naturally turns to the right, then A ∧βrepresents the area occupied by set A and the area occupied by set B, with a space in the middle, that is, 1. Therefore, assuming that it does not meet the meaning of the question, only when the value in set B is set to 1 and the union of the two is a real number, then the number less than 1 is more in line with the meaning of the question. Therefore, the value range of a is: less than 1. in other words