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作者 houseman1104 在 PTT [ Math ] 看板的留言(推文), 共13則
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1F推: 角平分線10/24 03:01
2F→: O是內心,平分角ACB=>D在BC上=>平分角ACD10/24 03:02
3F推: 角平分線定理的證明:http://goo.gl/QQ8Lhf10/24 03:05
6F推: ABC面積:ACD面積=BC:DC=AB+AC:AC10/24 03:37
7F→: AB˙BC˙SinC:CD˙BC˙SinC=AB+AC:AC10/24 03:38
8F→: 約掉SinC=>AB˙BC:CD˙BC=AB+AC:AC10/24 03:39
9F→: 內外相乘之後=>AB˙BC˙AC=CD˙BC˙(AB+AC)10/24 03:40
10F→: 移項後得解AB˙BC/(AB+AC)=CD10/24 03:41
11F推: 奇怪了答案跟你之前的不一樣OTZ10/24 03:44
12F→: 合理推測不是我算錯就是他算錯要不然就是兩個都錯10/24 03:45
1F推: 不是就單純的展開嗎? 還是有其他條件?10/08 23:05
2F→: 不好意思打錯,馬上更正09/22 03:37
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