题目内容
【题目】命题“x∈R,x2+1≥1”的否定是( )
A.x∈R,x2+1<1
B.x∈R,x2+1≤1
C.x∈R,x2+1<1
D.x∈R,x2+1≥1
【答案】C
【解析】解:∵原命题“x∈R,有x2+1≥1”
∴命题“x∈R,有x2+1≥1”的否定是:
x∈R,使x2+1<1.
故选C.
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题目内容
【题目】命题“x∈R,x2+1≥1”的否定是( )
A.x∈R,x2+1<1
B.x∈R,x2+1≤1
C.x∈R,x2+1<1
D.x∈R,x2+1≥1
【答案】C
【解析】解:∵原命题“x∈R,有x2+1≥1”
∴命题“x∈R,有x2+1≥1”的否定是:
x∈R,使x2+1<1.
故选C.