陳亮君 等差數列與級數
- https://www.youtube.com/watch?v=LubGGk81dpI
- https://www.youtube.com/watch?v=v8X6RNiJJgo
- https://www.youtube.com/watch?v=vNKpEFsiiGo
- https://www.youtube.com/watch?v=s9UNArYQMRQ
- https://www.youtube.com/watch?v=VIp9834HQaY
- https://www.youtube.com/watch?v=-L-AOU_aV5A(sum)
- https://www.youtube.com/watch?v=xWTGPfzkEtw(6.sum)
- https://www.youtube.com/watch?v=xWTGPfzkEtw(7.sum)
- https://www.youtube.com/watch?v=Th_EUPVj_SY(8.sum)
