{"type":"rich","version":"1.0","title":"u-代换积分法步骤","description":"换元积分法（u 代换）的步骤","author_name":"Padlet Arcade","thumbnail_url":"https://arcade.padlet.com/open-graph/social-preview-image.png?timestamp=1780957733017&hashid=zqrv4g1Wp1","html":"<iframe src=\"https://arcade.padlet.com/embed/zqrv4g1Wp1\" width=\"720\" height=\"480\" frameborder=\"0\" allowfullscreen></iframe>","width":720,"height":480,"provider_name":"Padlet Arcade","provider_url":"https://arcade.padlet.com"}