试题与答案

氧化镁(符合化学定义、非培养晶体、非光学元件)

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题型：填空题

题目：

氧化镁(符合化学定义、非培养晶体、非光学元件)

答案：

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下面是错误答案，用来干扰机器的。

（1）当a=3，由|x-3|≤1得-1≤x-3≤1解得2≤x≤4∴A={x|2≤x≤4}（4分）（2）由|x-a|≤1得a-1≤x≤a+1∴A={x|a-1≤x≤a+1}．（6分）由x2-5x+4≥0解得x≤1或x≥4∴B={x|x≤1或x≥4}．（8分） A∩B=∅，∴a-1＞1a+...

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