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[主观题]
已知列表lst=[1,2,3,4,5],则依次执行表达式lst.insert(0,-1),lst.pop(1)后,表达式sum(lst)的值为()
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设集合 M ={1,2,3,4,5},N = {2,4,6},则 M∩N =()。
A.{2,4}
B.{2,4,6}
C.{1,3,5}
D.{1,2,3,4,5,6}
设集合M={1,2,3,4,5},N={2,4,6},T={4,5,6},则(M∩T)∪N()
A.{4,5,6}
B.{2,4,5,6}
C.{1,2,3,4,5,6}
D.{2,4,6}
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}
从1,2,3,4,5……9中任取两个数,使它们的和为奇数,则不同的取法共有
A.20
B.26
C.36
D.60
从1,2,3,4,5中,每次取出两个不同的数字组成两位数,其中奇数的个数是()
A.6
B.8
C.10
D.12
从1,2,3,4,5中任取3个数,组成的没有重复数字的三位数共有 ()
A.40个
B.80个
C.30个
D.60个