推 suhorng :1+1/4-1/9+1/16+1/25-1/36+1/49+1/64-1/81... 03/13 21:13
→ suhorng :如果要交錯級數的話,也可能非遞減但是收斂 03/13 21:15
→ suhorng :比如 1/k 與 1/k^2 兩項兩項交替出現 03/13 21:16
→ suhorng :然後正負交錯 1-1/2+1/4-1/9+1/3-1/4+1/16-1/25... 03/13 21:16
→ handsomepow :THX 03/13 23:12