(3)设A={x}-2
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(3)设A={x}-2
(3)设A={x}-2
(3)设A={x}-2
C
1356 1256 12 12456
[-7,-1]∪[4,7] [-7,-2)∪(3,7] [-7,-1]∪(3,7] [-7,-2)∪[4,7]
(3)设A={x}-2
(3)设A={x}-2
(3)设A={x}-2
C
1356 1256 12 12456
[-7,-1]∪[4,7] [-7,-2)∪(3,7] [-7,-1]∪(3,7] [-7,-2)∪[4,7]