The teacher provided a model answer to the complex math problem to illustrate the correct approach.
老师提供了一个复杂数学题的标准答案，以说明正确的解题方法。
Students are encouraged to compare their answers with the model answer to identify areas for improvement.
学生被鼓励将自己的答案与标准答案进行比较，以找出需要改进的地方。