在化学计算中．运用讨论法解题具有灵活性、研讨性、发散性等鲜明特征,是培养良好的解题能力,灵活运用知识能力的最好方法之一。讨论法可分为不定方程讨论、过量问题讨论、可能结果讨论、组合讨论、极值讨论法等。一、不定方程讨论【例1】某含氧酸的化学式为HnXO2n-1,该含氧酸受热分解后生成的氧化物的化学式可能是( ) In chemical calculations. The use of the discussion method to solve problems with distinctive features such as flexibility, research, and divergence is one of the best ways to develop a good problem-solving ability and flexible use of knowledge. The discussion method can be divided into indefinite equation discussion, overdose discussion, possible outcome discussion, combination discussion, and extremum discussion. An indefinite equation is discussed. [Example 1] The chemical formula of an oxo acid is HnXO2n-1. The chemical formula of the oxide formed after the oxo acid is decomposed by heat may be ()