an |
n |
A.p1,p2 | B.p3,p4 | C.p2,p3 | D.p1,p4 |
an |
n |
an+1 |
n+1 |
an |
n |
nan+1-(n+1)an |
n(n+1) |
nd-an |
n(n+1) |
1 |
2 |
1 |
8 |
1 |
2 |
A.①②③ | B.①② | C.①③ | D.②③ |
A.①② | B.②③ | C.③④ | D.③ |
A.命题“若x2-3x-4=0,则x=4”的逆否命题为“若x≠4,则x2-3x-4≠0” |
B.“若a=1,则a2=1”的逆命题是“若a2=1,则a=1” |
C.若p∧q为假命题,则p,q都是假命题 |
D.命题p:空间中,相交于同一点的三条直线在同一平面内,则¬p:空间中,相交于同一点的三条直线不在同一平面内 |
a |
b |
b |
a |
a |
b |
c |
OM |
1 |
3 |
OA |
1 |
3 |
OB |
1 |
3 |
OC |
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