1.集合S={0,1,2,3,4,5}A是S的一个子集,当x属于A时,若有x-1不属于A,且x+1不属于A,则称x为A的“孤立元素”那么S中有"孤立元素"的四元子集的个数是几个?2.若集合A={x|x=f(x)},B={x|x=f[f(x)]}.求证:A是B的子
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/08 05:54:49
![1.集合S={0,1,2,3,4,5}A是S的一个子集,当x属于A时,若有x-1不属于A,且x+1不属于A,则称x为A的“孤立元素”那么S中有](/uploads/image/z/13854419-35-9.jpg?t=1.%E9%9B%86%E5%90%88S%3D%7B0%2C1%2C2%2C3%2C4%2C5%7DA%E6%98%AFS%E7%9A%84%E4%B8%80%E4%B8%AA%E5%AD%90%E9%9B%86%2C%E5%BD%93x%E5%B1%9E%E4%BA%8EA%E6%97%B6%2C%E8%8B%A5%E6%9C%89x-1%E4%B8%8D%E5%B1%9E%E4%BA%8EA%2C%E4%B8%94x%2B1%E4%B8%8D%E5%B1%9E%E4%BA%8EA%2C%E5%88%99%E7%A7%B0x%E4%B8%BAA%E7%9A%84%E2%80%9C%E5%AD%A4%E7%AB%8B%E5%85%83%E7%B4%A0%E2%80%9D%E9%82%A3%E4%B9%88S%E4%B8%AD%E6%9C%89%22%E5%AD%A4%E7%AB%8B%E5%85%83%E7%B4%A0%22%E7%9A%84%E5%9B%9B%E5%85%83%E5%AD%90%E9%9B%86%E7%9A%84%E4%B8%AA%E6%95%B0%E6%98%AF%E5%87%A0%E4%B8%AA%3F2.%E8%8B%A5%E9%9B%86%E5%90%88A%3D%7Bx%7Cx%3Df%28x%29%7D%2CB%3D%7Bx%7Cx%3Df%5Bf%28x%29%5D%7D.%E6%B1%82%E8%AF%81%EF%BC%9AA%E6%98%AFB%E7%9A%84%E5%AD%90)
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