题目内容
若| a |
| b |
| 4 |
| 5 |
| a |
| 2a+b |
分析:根据比例的基本性质求得
的值,然后将它代入2+
求得2+
=
;所以
=
=
.
| b |
| a |
| b |
| a |
| b |
| a |
| 13 |
| 4 |
| a |
| 2a+b |
| 1 | ||
2+
|
| 4 |
| 13 |
解答:解:∵
=
,
∴
=
;
∴
=2+
=2+
=
;
∴
=
.
故答案是:
.
| a |
| b |
| 4 |
| 5 |
∴
| b |
| a |
| 5 |
| 4 |
∴
| 2a+b |
| a |
| b |
| a |
| 5 |
| 4 |
| 13 |
| 4 |
∴
| a |
| 2a+b |
| 4 |
| 13 |
故答案是:
| 4 |
| 13 |
点评:本题考查了比例的基本性质:两内项之积等于两外项之积.
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