Situation A: "Formulating a problem mathematically."The "marble problem" was presented to students not by sentences but by a game situation as follows:Teacher: We will play a game of throwing marbles on a piece of paper and comparing how much the marbles scattered. Winner is the one whose marbles scattered most. Let's see, each of the three people, A, B and C, threw marbles, and the marbles scattered in this way (teacher shows the students figures). Who do you think is the winner?