a1(1-qn) |
1-q |
a |
cosA |
b |
cosB |
c |
cosC |
x2+4 |
1 | ||
|
a1(1-qn) |
1-q |
a |
cosA |
b |
cosB |
c |
cosC |
x2+4 |
1 | ||
|
5 |
2 |
A.(0,1) | B.(-∞,0)∪(1,+∞) | C.[0,1] | D.(-∞,0)∪[1,+∞) |
AB |
BC |
CD |
DA |
0 |
AB |
CD |
AC |
BD |
AD |
BC |
AB |
AC |
AC |
AD |
AB |
AD |
OP |
OA |
OA |
OC |
A.1 | B.2 | C.3 | D.4 |
A.0 | B.3 | C.2 | D.1 |
A.若m∥n,m⊥α,n⊥β,则α⊥β | B.若m∥n,n⊥β,m⊂α,则α⊥β |
C.若m∥n,m⊂α,n⊂β,则α∥β | D.若m⊥α,m⊥n,n⊂β,则α∥β |
A.①和② | B.②和③ | C.③和④ | D.②和④ |
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