問題詳情
4.______若 ______若 A = {1,5,6,3,2 }，B = {2,3,9 }，則 A − B的子集合共有 4 個。
(A)O
(B)X
(A)O
(B)X
參考答案
答案：B[無官方正解]
難度：非常困難0
統計：A(2),B(6),C(0),D(0),E(0)
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