问题
填空题
设集合A={5,2a},B={a,b},A∩B={8},则A∪B=______.
答案
∵A={5,2a},B={a,b},A∩B={8},
∴2a=8,
∴a=3,b=8,
∴A∪B={3,5,8}.
故答案为:{3,5,8}.
设集合A={5,2a},B={a,b},A∩B={8},则A∪B=______.
∵A={5,2a},B={a,b},A∩B={8},
∴2a=8,
∴a=3,b=8,
∴A∪B={3,5,8}.
故答案为:{3,5,8}.