1、一、差比数列求和公式的内容:
https://v.youku.com/v_show/id_XMzg1OTM0Njg4MA==.html?spm=a2h0k.11417342.soresults.dtitle2、二、差比数列求和公式的证明
3、三、差比数列求和公式的应用举例
https://v.youku.com/v_show/id_XMzg1OTM0NjI4OA==.html?spm=a2h0j.11185381.listitem_page1.5!2~A1、一、差比数列求和公式的内容:
https://v.youku.com/v_show/id_XMzg1OTM0Njg4MA==.html?spm=a2h0k.11417342.soresults.dtitle2、二、差比数列求和公式的证明
3、三、差比数列求和公式的应用举例
https://v.youku.com/v_show/id_XMzg1OTM0NjI4OA==.html?spm=a2h0j.11185381.listitem_page1.5!2~A