log2 5-2log4 10
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解决时间 2021-03-03 02:23
- 提问者网友：
- 2021-03-02 21:03
log2 5-2log4 10
最佳答案
- 五星知识达人网友：英雄的欲望
- 2021-03-02 22:13
log2 5-2log4 10
=log2 5-2(log2 10)/(log2 4) [换底公式]
=log2 5-2[log2 (5×2)]/(log2 2²)
=log2 5-2[log2 (5×2)]/2
=log2 5-(log2 5+log2 2)
=log2 5-log2 5-log2 2
=-1
=log2 5-2(log2 10)/(log2 4) [换底公式]
=log2 5-2[log2 (5×2)]/(log2 2²)
=log2 5-2[log2 (5×2)]/2
=log2 5-(log2 5+log2 2)
=log2 5-log2 5-log2 2
=-1
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