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[判断题]
设集合A={1,2,3,4},B={6,8,12},A到B的二元关系R=那么R-1={<6,3>,<8,4>}.()
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A.{0,1,2,3,4,6}
B.{1,2,3,4}
C.{2,4}
D.{2,4,6}
设集合A={1,2,3},B={2,3},C={1,3,4},则(A∩B)∪C等于
A.{1,2,3}
B.{1,2,4}
C.{1,3,4}
D.{1,2,3,4}
设集合M={x|x≥4},N={ x|x<6},则M ∪ N等于() (A)实数集 (B){ x|-4≤x<6} (C)空集 (D){ x|-4<x<6}
设集合M={2,5,8},N={6,8},则以MUN
A.{2,5,6}
B.{8}
C.{6}
D.{2,5,6,8}
设
计算:(1)其中Aij是元素aaj(j=1,2,3,4)的代数余子式;
(2)其中Mij是元素aaj(j=1,2,3,4)的余子式。
设集合 A={2,3, a}, B={1,4}, 且A ∩B ={4 },则a = ()
A.1
B.2
C.3
D.4
设集合M={1,2,3,4,5},集合N={2,4,6},集合T={4,5,6},则(M ∩ T)U N是 () (A){2,4,6} (B){4,5,6} (C){1,2,3,4,5,6} (D){2,4,5,6}