→ math365 :倍(k>0),則角DBC是角BDC的幾倍? 答:k倍 06/16 09:37
→ math365 :剛剛最後一題沒打完...題目在上面 06/16 09:38
推 sleep123 :1. 用西瓦定理,先算AF:FB,設BD:DC=1:a,DO:OA=b:12 06/16 10:43
→ sleep123 : 得AF:FB=2:1,再解a,b 06/16 10:44
推 sleep123 :2. 題目講進位 (27)_9 = (2*9+7)_10 06/16 10:51
→ sleep123 : 解 5(x-2)=(25/7)(x+2) 06/16 10:51
推 sleep123 :3. 以A為圓心AB為半徑畫圓,BCD皆在圓上 06/16 10:55
→ sleep123 : 考慮圓周角圓心角即可 06/16 10:55
→ math365 :謝謝!!!你好棒 06/16 23:59