所谓逆向思维就是把问题倒过来想,从事物的反面去想.加强逆向思维的训练,可培养思维的流畅性、应变性和独特性.经常运用逆向思维解题,有助于巩固知识,提高智力和解题技巧.下面举例说明逆向思维的应用.一、逆用定义例1已知m,n为不相等的实数,且m2+m-1=0,n2+n-1=0.求mn-m-n的值. The so-called reverse thinking is to turn the question upside down and think about the opposite side of things. Strengthening the training of reverse thinking can foster the fluency, adaptability, and uniqueness of thinking. Frequently using reverse thinking to solve problems will help consolidate knowledge and improve Intelligence and problem-solving techniques. The following examples illustrate the application of reverse thinking. First, the inverse use definition example 1 is known that m, n are unequal real numbers, and m2+m-1=0, n2+n-1=0. The value of mn-mn.