There are two ways to do mathematical problems of space geometry, one is vector method, and the other is geometric method. Vector method pays more attention to calculation than thinking. This method is most suitable for girls, but one disadvantage of vector method is that it requires too much calculation. Once a number is wrong, everything will be lost, but there is no need to think about it. As long as the spatial coordinate system is established, the remaining is parallelism. Generally speaking, if you are careful, you can solve the problem quickly. Geometry is for students who think hard in an empty space. This method does not need to move too many pens, but only needs you to look at the picture for logical reasoning. This kind of logical reasoning is very complicated. Most people don't advocate this method, because the thinking is not agile, and people with high IQ will be confused by themselves, so they advocate solving problems with vector method instead of geometric method.