Mark what is known on the map, analyze it and see if there is any special angle or something.

Under normal circumstances, the first question is relatively simple, and strive for full marks.

Second, it is possible to find the area, grasp the graphic features, greatly reduce or find it directly. If you attach a problem of solving the equation or finding the maximum area, as long as the calculation passes, there is no problem.

The last question may be difficult. If it is not the focus of the exam, it is worthwhile to give up. If you remove 3 points, there is still 1 17, and all the questions you can do have scores, which is also very ideal. This needs specific analysis, and it is generally similar.