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由对数定义,直接得到一个恒等式:N=~((log)_a~N)。熟练掌握和灵活运用这个恒等式,对于正确理解对数概念,熟练地使用对数这一运算工具,具有很大的作用。下面举例说明对数定义恒等式的应用。
By the logarithm definition, an identity is obtained directly: N=~((log)_a~N). Mastering and using this identity fluently, it is very helpful to correctly understand the concept of logarithm and to use the logarithm of the computing tool skillfully. The following example illustrates the application of the logarithmically defined identity.