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好吧,集合的表示方法有三種,韋恩圖法,枚舉法和描述法.{x|x=1}使用的是描述法,以x為代表元,要求x符合“X=1”,即集合中只有一個元素“1“,這個集合與{1}這個單元集是等價的.{y|(y-1)²;}同上,也是描述法,只…
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