题目内容
如图,已知△ABC,点D、E分别在边AB、AC上,ED∥BC,
=
,求
的值.

| AE |
| EC |
| 1 |
| 3 |
| DE |
| BC |
∵
=
,
∴
=
,
∵ED∥BC,
∴
=
=
.
| AE |
| EC |
| 1 |
| 3 |
∴
| AE |
| AC |
| 1 |
| 4 |
∵ED∥BC,
∴
| DE |
| BC |
| AE |
| AC |
| 1 |
| 4 |
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题目内容
| AE |
| EC |
| 1 |
| 3 |
| DE |
| BC |
| AE |
| EC |
| 1 |
| 3 |
| AE |
| AC |
| 1 |
| 4 |
| DE |
| BC |
| AE |
| AC |
| 1 |
| 4 |