题目内容
已知2x=9,2y=
,则x+2y的值=______.
| 4 |
| 3 |
∵2x=9,2y=
,∴x=log29,y=log2
,
∴x+2y=log29+2log2
=log2(9×
)=log224=4.
故答案为4.
| 4 |
| 3 |
| 4 |
| 3 |
∴x+2y=log29+2log2
| 4 |
| 3 |
| 16 |
| 9 |
故答案为4.
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题目内容
| 4 |
| 3 |
| 4 |
| 3 |
| 4 |
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| 16 |
| 9 |