For example, in "looking for a regular lesson learning, some students at the textbook seemingly mastered the relevant knowledge, but the practice is still not, therefore, teachers in teaching way can give students an example about the life, also can let the students themselves to find the rule of life related to understand textbook content, is very common, teachers can use ceramic tile problem to let the students find rule to let the students thinking about the problem of permutation and combination, let the textbooks and life together is conducive to the improvement of teaching efficiency.