A.命题“若![]() ![]() |
B.命题“![]() ![]() ![]() ![]() ![]() |
C.设![]() ![]() ![]() |
D.若“![]() ![]() ![]() |
A.∃x∈R,lnx=0 | B.∃x∈R,tanx=![]() |
C.∀x∈R,x2>0 | D.∀x∈R,3x>0 |
A.“x>5”是“x>3”的必要不充分条件 |
B.命题“对∀x∈R,恒有x2+1>0”的否定是“∃x∈R,使得x2+1≤0” |
C.∃m∈R,使函数f(x)=x2+mx(x∈R)是奇函数 |
D.设p,q是简单命题,若p∨q是真命题,则p∧q也是真命题 |
A.p∧q | B.(![]() |
C.p∨q | D.(![]() ![]() |
A.[0,1) | B.(-∞,1) |
C.[1,+∞) | D.(-∞,1] |
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