命题“若x≤-2,则x2≥4”的逆否命题是( )。A.若X2≤4,则x≥一2 B.若x2-2 C.若x2≥4,则x≤-2 D.若x2>4,则x

作者: tihaiku 人气: - 评论: 0
问题 命题“若x≤-2,则x2≥4”的逆否命题是( )。
选项 A.若X2≤4,则x≥一2 B.若x2<4,则x>-2 C.若x2≥4,则x≤-2 D.若x2>4,则x<-2
答案 B
解析 原命题为“若P,则q”,则逆否命题为“若非q,则非P”。即为“若x2<4,则x>-2”。

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