比较下列各组的大小log(0.2)0.4,log(0.2)0.3,log(0.3)0.2和log(a)2,2log(2a)2,1 (1<a<2)
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解决时间 2021-08-01 05:49
- 提问者网友:夢醒日落
- 2021-07-31 20:39
比较下列各组的大小log(0.2)0.4,log(0.2)0.3,log(0.3)0.2和log(a)2,2log(2a)2,1 (1<a<2)
最佳答案
- 五星知识达人网友:玩家
- 2021-07-31 21:28
1、log(0.2)0.4,log(0.2)0.3,log(0.3)0.2
∵0<0.2<1,
∴log(0.2)1<log(0.2)0.4<log(0.2)0.3<log(0.2)0.2
即0<log(0.2)0.4<log(0.2)0.3<1
而log(0.3)0.2=1/log(0.2)0.3
∴log(0.3)0.2>1
∴log(0.2)0.4<log(0.2)0.3<log(0.3)0.2
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