A={1,2,3},B={x∈R|x²-ax+1=0,a∈A},则A∩B=B时a的值是 A.2 B.2或3 C.1或3 D.1或2

来源：学生作业帮助网编辑：作业帮时间：2024/04/30 05:56:30

A={1,2,3},B={x∈R|x²-ax+1=0,a∈A},则A∩B=B时a的值是 A.2 B.2或3 C.1或3 D.1或2
A={1,2,3},B={x∈R|x²-ax+1=0,a∈A},则A∩B=B时a的值是 A.2 B.2或3 C.1或3 D.1或2

A={1,2,3},B={x∈R|x²-ax+1=0,a∈A},则A∩B=B时a的值是 A.2 B.2或3 C.1或3 D.1或2
选D 等于一时 B是空集