高一数学必修一集合 高一数学必修一集合部分
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②当k≠0时,那么必有：
(1)：k>0
(2)：△=b^2-4ac≤0,即k^2+8k≤0
由(1),(2)可知k=∅
综上所述,不存在k值使得A=∅
PS：我不知道题目怎么设置的,给我感觉题目有一点问题
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