The solid geometry of liberal arts should be more difficult. You can learn to conquer space vectors, and the sequence will be a little more difficult. You can look at the knowledge of limits and derivatives.

The triangle should be simple, the probability is not difficult, and it should be accurate. Analytic geometry is a difficult point, so it is necessary to strengthen the calculation and find simple methods, such as Apollo tangent circle, two tangents and parabola to build the model.