A.存在x∈R,sin2
| ||||||
B.任意x∈(0,π),sinx>cosx | ||||||
C.任意x∈(0,+∞),ex>1+x | ||||||
D.存在x∈R,x2+x=-1 |
x |
2 |
x |
2 |
π |
6 |
1 |
2 |
3 |
4 |
A.① | B.①② | C.①③ | D.②③ |
π |
4 |
π |
4 |
m |
n |
7π |
4 |
3π |
4 |
m |
2 |
a |
b |
a |
b |
1 |
2 |
a |
b |
a |
b |
A.命题“若x≠1,则x2-3x+2≠0”的逆否命题是“若x2-3x+2=0,则x=1” |
B.若命题p:∀x∈R,x2+x+1≠0,则¬p:∃x∈R,x2+x+1=0 |
C.“x>2”是“x2-3x+2>0”的充分不必要条件 |
D.若p∨q为真命题,则p,q均为真命题 |
x |
1+|x| |
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