一题多解,有利于提高学生的分析推理能力、思维能力、方法的应用能力,因此在教学中适当提倡一题多解,是非常必要的.例1已知NOx+NH3→N2+H2O可治理工业废气NOx.现有NO和NO2混合气体3L,可用同温同压下3.5L NH3恰好使它完全转化为N2.则原混合气体中NO和NO2的体积比是多少?解析解法一列方程法设原混合气体中NO和NO2的体积分别为x和y Therefore, it is very necessary to advocate proper solution of one problem in teaching.Example 1 It is known that NOx + NH3 → N2 + H2O can be used to improve students’ ability of analysis and reasoning, thinking ability and application of methods. Treatment of industrial waste gas NOx. The existing NO and NO2 mixed gas 3L, available at the same temperature with the same pressure 3.5L NH3 just make it completely converted to N2. The original mixed gas NO and NO2 volume ratio? Let the volume of NO and NO2 in the original mixed gas be x and y, respectively