1:设集合A={x|(x-3)(X-a)=0,a∈R},B={x|(x-4)(x-1)=0},求A∪B,A∩B.

2:已知全集U=A∪B={x∈N|0≤x≤10},A∩(CuB)={1,3,5,7},试求集合B.