Answer: [Key points] (1) Jax-dodson Law: A moderate level of motivation is most conducive to the improvement of learning effect. The best motivation level is closely related to the difficulty of homework. The easier the task, the higher the best motivation level. The task difficulty is moderate, and the best motivation level is also moderate; The more arduous the task. The lower the optimal incentive level.

(2) Educational significance: In teaching, teachers should appropriately control the arousal of students' learning motivation according to the different difficulties of learning tasks. When learning easier and simpler topics, students should try their best to concentrate and be nervous; When studying more complicated and difficult subjects, we should try our best to create a relaxed and free classroom atmosphere. When students encounter difficulties or problems, they should try to guide them calmly and slowly to avoid excessive tension and anxiety.