已知特称命题P:$x∈R,2x+1≤0,则命题P的否定是( )
A.$x∈R,2x+1>0 | B."x∈R,2x+1>0 |
C.$x∈R,2x+1≥0 | D."x∈R,2x+1≥0 |
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已知特称命题P:$x∈R,2x+1≤0,则命题P的否定是( )
A.$x∈R,2x+1>0 | B."x∈R,2x+1>0 |
C.$x∈R,2x+1≥0 | D."x∈R,2x+1≥0 |
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