在实数运算中,为了解题的方便,我们有时可将“1”用另一种表达形式去代替,例如在代数式中,用a/a、a~0(a≠0)或log_aa(a>0,a≠1)代替“1”;在三角式中,用sin~2a+cos~2a或tgactga代替“1”,等等。这种替换,在复数的运算中同样是不可缺少的,如果使用得当,对寻求问题的合理解法或减少计算量都很有帮助,同时可以提高学生解题的技能技巧。复数中“1”的代换方法,常见的有以下几 In the real number operation, in order to understand the convenience of the question, we can sometimes replace “1” with another expression, for example, in algebraic expression, use a/a, a~0 (a≠0) or log_aa (a> 0, a≠1) instead of “1”; in the triangle, replace “1” with sin~2a+cos~2a or tgactga, and so on. This kind of replacement is also indispensable in the calculation of plural numbers. If used properly, it will be helpful for seeking understanding of the problem or reducing the amount of calculation, and at the same time it will improve the skills and skills for students to solve problems. The replacement method of “1” in the plural number is commonly found in the following