推 ss1132 :4.5和-4.5? 07/07 00:23
→ ss1132 :看錯== 07/07 00:24
→ ss1132 :1後面空很大? 07/07 00:24
推 XII :A+B=10,A-B=16x/10 => A=5+4x/5 => x=±10√2/3 07/07 00:26
推 ss1132 :用橢圓想答案6/5根號6? 07/07 00:32
→ ss1132 :正負 07/07 00:32
→ diow1 :謝謝 XII 大大 07/07 00:36