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所谓逆向思维,就是指把问题发生的顺序倒过来,采用逆推的方法逐步还原,从而使得我们顺利对事物进行正确的判断,简捷快速地得出正确的结果.下面举例说明活用逆向思维,巧解实际趣题的实例,希望能够增强同学们学习数学知识的兴趣,提高同学们解题的技能和技巧,发展创新意识和创新能力.例1某商场对顾客实行优惠,优惠措施如下:(1)如果一次性购物不超过200元的不予优惠:(2)如果一次购物超过200元但不超过500元的,按标价给予9折优惠;(3)如果一次购物超过500元,其中500元按(2)
The so-called reverse thinking, refers to the reverse order of occurrence of the problem, the use of reverse reduction gradually restore method, so that we successfully make the right things to judge, concise and fast to draw the correct results. The following examples illustrate the use of reverse thinking, clever Examples of practical topics are hoped to enhance students ’interest in learning math, enhance students’ skills and skills in problem solving, and develop innovative awareness and innovation ability. Example 1 A mall offers preferential treatment to customers as follows: (1 ) If the one-time shopping does not exceed 200 yuan discount: (2) If a shopping more than 200 but not more than 500 yuan, according to the price given 10% discount; (3) If a shopping more than 500 yuan, of which 500 yuan Press (2)