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六、设数法:设数法就是将原命题没有给出具体的数,比较抽象的判断题,假设一个具体数值,然后通过运算或推理,得出答案,从而作出正确的判断。例如:一个数增加它的20%后,再减少它的20%,结果等于原数。分析与判断:由于原题没有告诉一个数究竟是多少,因此,不妨我们假设原数就是100,增加它的20%后就是100×(1+20%)=120,再减少它的20%,就是120减少它的20%,即120×(1-20%)=96,由于100≠96,因此,可知原命题是错误的。
Sixth, set the number of law: Set number method is the original proposition did not give a specific number of more abstract judgment, assuming a specific value, and then through the operation or reasoning, the answer to make the right judgments. For example: a number increases its 20%, and then reduce it 20%, the result is equal to the original number. Analysis and Judgment: Since the original question did not tell how many a number, so, let us assume that the original number is 100, after increasing its 20% is 100 × (1 + 20%) = 120, and then reduce it by 20% It is 120 to reduce its 20%, that is 120 × (1-20%) = 96, because 100 ≠ 96, therefore, we can see that the original proposition is wrong.