已知数集A={a2,a+1,-3},B={a-3,2a-1,a2+1},AUB={-3},求AUB.

问题描述:

已知数集A={a2,a+1,-3},B={a-3,2a-1,a2+1},AUB={-3},求AUB.

AnB={-3}吧.a-3=-3.a=0或2a-1=-3,a=-1.a=0时不符要求.a=-1.AUB={1,0,-3,-4,2}