1 2
S=------------- 經整理可得 S + 2S - 1 = 0
1 ╴
2 + --------- 故 S = -1 ±√2
1
2+----- 依照「常理」判斷，應取S>0
2+...
想請問有沒有更嚴謹一點的「數學」說明？
證明 S>0 ？
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