题目内容
设3a=5b=
,则
+
=______.
| 15 |
| 1 |
| a |
| 1 |
| b |
∵3a=5b=
,
∴a=log3
=
,b=log5
=
,
∴
+
=
+
=
=
=2.
故答案为2.
| 15 |
∴a=log3
| 15 |
lg
| ||
| lg3 |
| 15 |
lg
| ||
| lg5 |
∴
| 1 |
| a |
| 1 |
| b |
| lg3 | ||
lg
|
| lg5 | ||
lg
|
| lg15 | ||
lg
|
| lg15 | ||
|
故答案为2.
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