真命题的正确性是从题设出发通过推理的方式证实的,而假命题的证明只需要举出一个反例就足够了,但有的假命题的反例比较难找,比如证明“有一组对角及一组对边相等的四边形是平行四边形”是假命题时,其反例就 The correctness of the true proposition is confirmed from the hypothesis by way of reasoning, and the proof of false proposition only needs to give a counterexample. However, some counterexamples of false propositions are more difficult to find, such as proving that there is a group of Corner and a set of equal quadrilateral is parallelogram "is a false proposition, the counterexample