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任何一个实数与1之积等于其本身,利用这一特性可添加因子1而又不改变其结果.用此性质可巧证不等式,下面举例说明,供读者参考.
The product of any real number and 1 is equal to itself, using this feature can add a factor of 1 without changing the results. With this property can be concise inequality, the following examples, for reference.