已知集合A={a2,a+1,-3},B={a-3,2a-1,a2+1},若A∩B={-3},则a的值为(  ) A.a=0或-1 B.a=0 C.a=-1 D.a=-2或0

问题描述:

已知集合A={a2,a+1,-3},B={a-3,2a-1,a2+1},若A∩B={-3},则a的值为(  )
A. a=0或-1
B. a=0
C. a=-1
D. a=-2或0

∵A={a2,a+1,-3},B={a-3,2a-1,a2+1},若A∩B={-3},
∴a-3=-3或2a-1=-3或a2+1=-3,
解得:a=0或a=-1,
将a=0代入得:A={0,1,-3},B={-3,-1,1},此时A∩B={1,-3},不合题意;
将a=-1代入得:A={1,0,-3},B={-4,-3,2},此时A∩B={-3},满足题意,
则a=-1.
故选:B.