设集合A={a^2;,a+2,-3},B={a-3,2a-1,a^2;+1}.AnB={-3},求A∪B.(2)已知全集U=R,A={x|-x^2+3x>0},B={x||x-3|<a},若A∩B=空集,求实数a的取值范围.

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