The first question: will the postgraduate entrance examination add points? Tell you clearly, I will give points. For example, you can't use Laplace transform to solve the initial value problem of ordinary differential equations, or you can't define a high-dimensional space mapping and a series of operations, but the operator method does not involve operations outside the scope of the examination.

The second question: when grading, the step of solving the special solution is to give the score as a whole. You only need to give the method to solve the special solution, and you can score by solving the special solution. Only when you get the wrong solution will you get extra points according to the correct workload of this step. So you don't need to be specific, but you must fully express the necessary process of writing your special plan, which means you must show that your special plan is so harsh.

The third question: I got the correct solution, but will teachers of different forms not know it? Tell you clearly, I won't know. Although the differential operator method is not specified in the high number, it is an important content of mathematical analysis. The people who read your thesis are all teachers from the School of Mathematics. It's impossible for them not to know that the special solution obtained by differential operator method is slightly different in form, so they won't misjudge you and don't have to worry at all.