数学开放题的最大特点是起点低、受众广,不同层次的学生可以从不同角度思考问题,这扩大了学生自主发展的空间,有利于学生良好思维品质的发展。近年来,笔者一直执教双班。某日,在同轨的A班和B班出示了同一道开放题,A班学生中仅有1/10的人举手回答,其他学生束手无策;而B The most prominent feature of the open question of mathematics is the low starting point, wide audience, different levels of students can think from different angles, which expand the space for students to develop independently, is conducive to the development of good thinking quality of students. In recent years, I have been coaching two classes. On the same day, students in class A and class B presented the same open question. Only 1 in 10 students in class A raised their hands and answered, while other students were at a loss. B