集合与数不懂嗯还有那个“一个空集是任何集合的子集.通常用¢或{}那什么意思?若A,B是X的子集,我们定义:A ∪ B = {x∈X丨x∈A 或 x∈B}
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![集合与数不懂嗯还有那个“一个空集是任何集合的子集.通常用¢或{}那什么意思?若A,B是X的子集,我们定义:A ∪ B = {x∈X丨x∈A 或 x∈B}](/uploads/image/z/9483885-45-5.jpg?t=%E9%9B%86%E5%90%88%E4%B8%8E%E6%95%B0%E4%B8%8D%E6%87%82%E5%97%AF%E8%BF%98%E6%9C%89%E9%82%A3%E4%B8%AA%E2%80%9C%E4%B8%80%E4%B8%AA%E7%A9%BA%E9%9B%86%E6%98%AF%E4%BB%BB%E4%BD%95%E9%9B%86%E5%90%88%E7%9A%84%E5%AD%90%E9%9B%86.%E9%80%9A%E5%B8%B8%E7%94%A8%EF%BF%A0%E6%88%96%EF%BD%9B%EF%BD%9D%E9%82%A3%E4%BB%80%E4%B9%88%E6%84%8F%E6%80%9D%3F%E8%8B%A5A%2CB%E6%98%AFX%E7%9A%84%E5%AD%90%E9%9B%86%2C%E6%88%91%E4%BB%AC%E5%AE%9A%E4%B9%89%EF%BC%9AA+%E2%88%AA+B+%3D+%EF%BD%9Bx%E2%88%88X%E4%B8%A8x%E2%88%88A+%E6%88%96+x%E2%88%88B%EF%BD%9D)
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