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解答题已知集合A={2,4,6,8,9},B={1,2,3,5,8},又知非空
解答题已知集合A={2,4,6,8,9},B={1,2,3,5,8},又知非空
发布时间:2020-07-28 18:11:42
解答题已知集合A={2,4,6,8,9},B={1,2,3,5,8},又知非空集合C是这样一个集合:其各元素都加2后,就变为A的一个子集;若各元素都减2后,则变为B的一个子集,求集合C
网友回答
C={4}或{7}或{4,7}解析逆向操作:A中元素减2得0,2,4,6,7,则C中元素必在其中;B中元素加2得3,4,5,7,10,则C中元素必在其中;所以C中元素只能是4或7.
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