等比數列級數

 陳亮君 等比數列與級數

1. https://www.youtube.com/watch?v=YoRxZ1elmDg
2. https://www.youtube.com/watch?v=kiWvCMNjCZE
3. https://www.youtube.com/watch?v=jc5tgaAV_4o
4. https://www.youtube.com/watch?v=Y4idm8i8KBg
   

https://www.youtube.com/watch?v=8aFK3br8QfU