1. From a macro point of view, Question A is divided into two questions. The first question is to let you build a concrete model, and the second question is to let you build a general model to verify whether your model is good or bad! The popular point is: concrete to abstract.

2. Question A, if understood from the aspect of investigation, can be like this (of course, other methods can also be used):

(1) Use your knowledge of calculus and spatial analytic geometry to establish the corresponding relational equation, and then use the data in the topic and choose the appropriate parameter fitting method to fit the parameters in your relational equation; So the first problem can be solved! Then the first question can lead you to solve the second question.

(2) After the first question is solved, the second question will be easy to handle, because the second question is the general situation of the first question, so everyone only needs to establish a general model, and the key is the test and correction of the model, which is the key to the second question; So everyone should pay attention. '

(Note: What is provided here is only an inspection standard, and the topic can be inspected from other aspects. 3. If you haven't studied the combination of calculus and spatial analysis, you can find a book on advanced mathematics or fractional mathematics, and then look at the set application of infinitesimal methods and the content of spatial analysis geometry!

All right, that's all.

Finally, I wish you good grades and excellent papers.