Forgot password
 Register account
View 1736|Reply 3

[函数] 2018四川初赛对数计算题目

[Copy link]

132

Threads

251

Posts

1

Reputation

Show all posts

郝酒 posted 2018-6-27 10:27 |Read mode
$$\frac{1-2\log_65\cdot\log_{10}3\cdot\log_{15}2}{\log_65\cdot\log_{10}3+\log_{10}3\cdot\log_{15}2+\log_{15}2\cdot\log_{6}5}$$

673

Threads

110K

Posts

218

Reputation

Show all posts

kuing posted 2018-6-27 10:39
记 `x=\ln2`, `y=\ln3`, `z=\ln5`,则 `\log_65=z/(x + y)`, `\log_{10}3=y/(z + x)`, `\log_{15}2=x/(y + z)`,代入即得。

132

Threads

251

Posts

1

Reputation

Show all posts

original poster 郝酒 posted 2018-6-27 14:20
算出来啦,感觉还是有点复杂呀!

13

Threads

898

Posts

8

Reputation

Show all posts

色k posted 2018-6-27 18:35
就这丁点计算量都嫌复杂?

Quick Reply

Advanced Mode
B Color Image Link Quote Code Smilies
You have to log in before you can reply Login | Register account

$\LaTeX$ formula tutorial

Mobile version

2025-7-15 14:19 GMT+8

Powered by Discuz!

Processed in 0.012351 seconds, 22 queries