a |
b |
c |
a |
c |
b |
c |
π |
3 |
OA |
a |
OB |
b |
OD |
d |
a |
b |
d |
c |
α |
2 |
β |
2 |
π |
2 |
a•c |
|a||c| |
1-cosα | ||
|
|
α |
2 |
π |
2 |
α |
2 |
b•c |
|b||c| |
1+cosβ | ||
|
|
β |
2 |
π |
2 |
α |
2 |
β |
2 |
π |
3 |
π |
2 |
α |
2 |
β |
2 |
π |
3 |
π |
3 |
1 |
2 |
AB |
OB |
OA |
b |
a |
AB |
(cosβ+cosα)2+(sinβ-sinα)2 |
2+2cos(β+α) |
3 |
a |
b |
d |
c |
d |
c |
a |
b |
AD |
OD |
OA |
d |
a |
AD |
(2cosα-cosβ)2+(2sinα+sinβ)2 |
5-4cos(β-α) |
3 |
BD |
3 |
AB |
AD |
BD |
AB |
AC |
AE |
A.BC边的垂直平分线上 |
B.BC边的中线所在的直线上 |
C.BC边的高线所在的直线上 |
D.BC边所在的直线上 |
a1 |
a2 |
a3 |
an |
a1 |
a2 |
a3 |
an |
a1 |
a2 |
a3 |
an |
a1 |
a2 |
a3 |
AH |
AB |
AH |
AC |
BH |
BA |
BH |
BC |
OA |
OB |
OC |
OH |
A.内心 | B.外心 | C.重心 | D.垂心 |
a |
b |
a |
b |
a |
b |
A.t1=-4,t2=-1 | B.t1=-4,t2=1 |
C.t1=4,t2=-1 | D.t1=4,t2=1 |
a |
b |
a |
b |
A.(-∞,-2]∪[2,+∞) | B.(-∞,-2)∪(2,+∞) | C.(-2,2) | D.[-2,2] |
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