Question

已知命題p:,若非是非的必要不充分條件，求實數m的取值范圍.

Answer 1

p:－2≤x≤10,記P="[?2,10]            "
q:1-m≤x≤1+m(m＞0), 記Q="[1-m," 1+m]                    6’
∵非是非的必要不充分條件 ∴是的必要不充分條件    
∴Q(≠P                                          8’
∴且“=”不同時成立           ∴ m≥9  

解析