6 |
x |
A.0 | B.1 | C.2 | D.3 |
6 |
x |
x | 20 |
A.①②③④ | B.①③④ | C.②④ | D.②③④ |
A.命题“若x2>1,则x>1”的否命题为“若x2>1,则x≤1” |
B.“x>1”是“x2+x-2>0”的充分不必要条件 |
C.命题“∃x∈R,使得x2+x+1<0”的否定是“∀x∈R,都有x2+x+1>0” |
D.若p∧q是假命题,则p,q都是假命题 |
A.若
| B.若|
| ||||||||||||||||||||||||
C.若ac2>bc2,则a>b | D.5>3 |
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