4log(2╱3)∧3+2log(2╱3)∧4+log(2╱3)∧20-log(2╱3)∧30 =?
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解决时间 2021-03-08 09:06
- 提问者网友:我们很暧昧
- 2021-03-07 15:36
4log(2╱3)∧3+2log(2╱3)∧4+log(2╱3)∧20-log(2╱3)∧30 =?
最佳答案
- 五星知识达人网友:琴狂剑也妄
- 2021-03-07 16:36
4log(2╱3)∧3+2log(2╱3)∧4+log(2╱3)∧20-log(2╱3)∧30
=12log(2╱3)+8log(2╱3)+20log(2╱3)-30log(2╱3)
=(12+8+20-30)log(2/3)
=10log(2/3)
=12log(2╱3)+8log(2╱3)+20log(2╱3)-30log(2╱3)
=(12+8+20-30)log(2/3)
=10log(2/3)
全部回答
- 1楼网友:你可爱的野爹
- 2021-03-07 17:45
解:应运换底公式 ㏒a n=(㏒b n)/(㏒b a) 将上述式子转换 (log4 3 log8 3)*(log3 2 log9 2) =[log4 3 (log4 3)/(log4 8)]×[log3 2 (log3 2/log3 9)] =(log4 3 2/3log4 3)×(log3 2 1/2log3 2) =(5/3log4 3)×(3/2log3 2) =5/3log4 3×3/2×1/2/log4 3 =5/3×3/2×1/2=5/4
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