题目内容
设x表示一个沿数轴做随机运动的质点位置，试说明下列各对事件间的关系（1）A ={|x-a|＜σ}，B ={x - a＜σ}；（2）A ={x＞20}，B ={x≤22}；（3）A ={x＞22}，B ={x＜19}
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