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

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

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