The following sets are subsets of N, which of the sets are closed under normal addition operations
A、{x|Xisamultipleof30};
B、{x|ThepowerofXcanbedividedby16};
C、{x|Xand5mutualquality};
D、{x|Xisafactorof30}
发布时间：2025-11-04 23:37:39
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答案：{x | X is a multiple of 30}
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