x2 |
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y2 |
2 |
1 |
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5 |
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A.p或q | B.¬p或q | C.¬p且q | D.p且q |
A.命题“若a=0,则ab=0”的否命题是:“若a≠0则ab≠0” |
B.若命题p:∃x∈R,x2-x+1<0,则¬p:∀x∈R,x2-x+1≥0 |
C.如果命题“¬p”与命题“p或q”都是真命题,那么命题q一定是真命题 |
D.命题“∃x∈R,x2+2x+2≤0”是真命题 |
A.若x∉A,则y∉A | B.若y∉A,则x∈A |
C.若x∉A,则y∈A | D.若y∈A,则x∉A |
1 |
a |
1 |
b |
A.1 | B.2 | C.3 | D.4 |
A.命题“若x2-4x+3=0,则x=3”的逆否命题是:“若x≠3,则x2-4x+3≠0” |
B.“x>1”是“|x|>0”的充分不必要条件 |
C.若p且q为假命题,则p、q均为假命题 |
D.命题p:“∃x∈R使得x2+x+1<0”,则¬p:“∀x∈R,均有x2+x+1≥0” |
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