题目内容
如图,
=
,
=
.求证:
=
.
| AM |
| 1 |
| 3 |
| AB |
| AN |
| 1 |
| 3 |
| AC |
| MN |
| 1 |
| 3 |
| BC |
证明:∵
=
,
=
,
∴
=
-
=
(
-
)=
.
| AM |
| 1 |
| 3 |
| AB |
| AN |
| 1 |
| 3 |
| AC |
∴
| MN |
| AN |
| AM |
| 1 |
| 3 |
| AB |
| AC |
| 1 |
| 3 |
| BC |
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