从问题的反面去想问题在数学上表现为 反证法.反证法是一种间接证法.它在证明一 个数学命题时,先提出与命题结论相反的假 设,然后以此为依据,经过推理得出矛盾的结 果,证明了与命题结论相反的假设不成立,从 而肯定了原来命题结论成立. 如能在生活中有意识地用反证法去思考, Think of the problem from the wrong side of the problem in mathematics as the anti-evidence method. The anti-evidence method is an indirect proof method. When it proves a mathematical proposition, it first puts forward the hypothesis that is opposite to the conclusion of the proposition. Based on this, it is inferred through inference. The result proves that the hypothesis contrary to the conclusion of the proposition is not true, thus affirming that the original proposition conclusion is established. If one can consciously use the anti-evidence method to think in life,