题目内容
如图,在△ABC的边AB、AC上分别取点M、N,使
=
,
=
,BN与CM交于点P,若
=λ
,
=μ
,则
的值为( )

| AM |
| 1 |
| 3 |
| AB |
| AN |
| 1 |
| 4 |
| AC |
| BP |
| PN |
| PM |
| CP |
| λ |
| μ |
A.
| B.
| C.
| D.12 |
| AP |
| AN |
| NP |
| 1 |
| 4 |
| AC |
| 1 |
| λ+1 |
| NB |
=
| 1 |
| 4 |
| AC |
| 1 |
| λ+1 |
| AB |
| AN |
=
| 1 |
| 4 |
| AC |
| 1 |
| λ+1 |
| AB |
| 1 |
| 4 |
| AC |
=
| λ |
| 4(λ+1) |
| AC |
| 1 |
| λ+1 |
| AB |
| AP |
| AM |
| MP |
| 1 |
| 3 |
| AB |
| μ |
| μ+1 |
| MC |
=
| 1 |
| 3 |
| AB |
| μ |
| μ+1 |
| AC |
| AM |
=
| 1 |
| 3 |
| AB |
| μ |
| μ+1 |
| AC |
| 1 |
| 3 |
| AB |
=
| μ |
| μ+1 |
| AC |
| 1 |
| 3(μ+1) |
| AB |
所以
|
|
所以
| λ |
| μ |
故选D.
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