课题内容为人教版小学数学四年级下册第五单元第3课时——三角形三边的关系。达成目标如下:观看微课视频并结合自学教材,在完成学习任务单规定的任务的基础上理解和掌握三角形两边之和大于第三边;体会两点间所有连线中线段最短,知道两点间的距离;感受数学和生活的密切联系。 Topics for the PEP Primary School Math grade four volume fifth Unit Lesson 3 - the relationship between the three sides of the triangle. Achieve the goal as follows: Watch the video and combined with self-study teaching materials, to complete the task of learning tasks based on the understanding and mastery of both sides of the triangle is greater than the third and the third; experience the connection between the two points in the shortest line, that two The distance between; feel the close connection between mathematics and life.