等差數列級數

 陳亮君 等差數列與級數

1. https://www.youtube.com/watch?v=LubGGk81dpI
2. https://www.youtube.com/watch?v=v8X6RNiJJgo
3. https://www.youtube.com/watch?v=vNKpEFsiiGo
4. https://www.youtube.com/watch?v=s9UNArYQMRQ
5. https://www.youtube.com/watch?v=VIp9834HQaY
6. https://www.youtube.com/watch?v=-L-AOU_aV5A(sum)
7. https://www.youtube.com/watch?v=xWTGPfzkEtw(6.sum)
8. https://www.youtube.com/watch?v=xWTGPfzkEtw(7.sum)
9. https://www.youtube.com/watch?v=Th_EUPVj_SY(8.sum)