2 |
AB |
BC |
A.4 | B.-4 | C.2 | D.-8 |
AB |
BC |
AB |
2 |
BC |
2 |
| ||
2 |
AB |
BC |
2 |
| ||
2 |
OA |
sinA |
sinA+sinB |
OB |
OA |
sinB |
sinB+sinA |
OC |
OA |
0 |
A.AB边上 | B.AC边上 | C.BC边上 | D.△ABC内心 |
2 |
3 |
BP |
BA |
BC |
AB |
AC |
| ||
4 |
PM |
PN |
A.(-∞,-5]∪[5,+∞) | B.(-∞,-25]∪[25,+∞) |
C.[-25,25] | D.[-5,5] |
AB |
MA |
MD |
A.1 | B.2 | C.3 | D.4 |
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