1 |
4 |
A.0个 | B.1个 | C.2个 | D.3个 |
1 |
4 |
1 |
2 |
1 |
4 |
1 |
2 |
1 |
2 |
A.若m⊥α,m⊥n,则n∥α | B.若m⊂α,n⊥α,则n⊥m |
C.若m∥α,n∥α,则α∥β | D.若α⊥β,n⊥α,则n⊥α |
A.对于命题p:∃x∈R,x2+x+1<0,则¬p:∀x∈R,x2+x+≥0 |
B.“x=1”是“x2-3x+2=0”的充分不必要条件 |
C.命题“若x2-3x+2=0,则x=1”的逆否命题为“若x≠1,则x2-3x+2≠0” |
D.若p∧q为假命题,则p,q均为假命题 |
x2 |
3+a |
y2 |
a-1 |
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