推 deryann :證明部分,可用反證法 12/03 17:29
推 amozartea :理解正確 12/03 17:35
→ smilerr :謝謝樓上兩位 12/04 12:19
→ ideaptt :basically, the concept of 1. is right since 12/05 01:50
→ ideaptt :it will be a def. to orthogonal(perpendicular) 12/05 01:50
→ ideaptt :vectors 12/05 01:50
→ jollic :第二小題就直接寫成r,s的聯立方乘組去解 12/06 07:00