一、创设问题情境,激发学习兴趣。宋代著名学者陆九渊说:“为学患无疑,疑则有进,小疑小进,大疑大进。”故学生在学习中没有问题就没有兴趣、没有思维、没有创新。如在讲完圆柱的体积公式V=sh后,要介绍圆锥的体积公式,我拿着等底等高的圆柱(无一底)和圆锥(无底)的模型,问学生,这 First, create a problem situation, stimulate interest in learning. Lu Jiuyuan, a famous scholar in the Song Dynasty, said: "There is no doubt that there is a problem for the students. There is no doubt that there is no doubt or no innovation. For example, after speaking out the volume formula of a cylinder, V = sh, to introduce the volume formula of a cone, I asked the students to hold the model of a cylinder of the same height (without a bottom) and a cone