《数学课程标准(2011年版)》明确指出:课堂教学应激发学生兴趣,调动学生积极性,引发学生的数学思考,鼓励学生的创造性思维。教师要为学生的数学学习创设有效的教学情境。学生在学习数学时,教师可以创设有效的问题情境,激发学生的学习积极性,进而有效地探究。有效的问题情境,可以迅速地集中学生的注意力。问题情境的有效,可以明确指向数学的本质,让学生能够把握住解决一类问题的结构特征。在平时的教学中,教师要 The Mathematical Curriculum Standard (2011 Edition) clearly states: Classroom teaching should stimulate students ’interest, arouse students’ enthusiasm, trigger students ’mathematical thinking and encourage students’ creative thinking. Teachers should create effective teaching situations for students’ math learning. Students learn mathematics, teachers can create effective problem situations, stimulate students’ enthusiasm for learning, and then explore effectively. Effective problem situations can quickly concentrate students’ attention. Effectiveness of the problem situation can be clearly pointed to the nature of mathematics, so that students can grasp the structural characteristics of solving a problem. In normal teaching, teachers want