Set a = [1,2], B = {x | 2x ^ 2-ax + 1 > 0}, if a ∩ B is not equal to the empty set, then the value range of real number a is? If a is really included in B, then the value range of a is? RT

Set a = [1,2], B = {x | 2x ^ 2-ax + 1 > 0}, if a ∩ B is not equal to the empty set, then the value range of real number a is? If a is really included in B, then the value range of a is? RT

(1) A ∩ B is not equal to an empty set, that is, there is at least one inequality satisfying B in the middle of x = 1,2
If 2x ^ 2-ax + 1 > 0, a is obtained