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作者 kin30503 在 PTT [ Math ] 看板的留言(推文), 共16則
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3F推:恩恩 我也是寫這答案06/11 00:05
1F推:看成k^4+18^2去把他配方即可12/11 12:14
6F推:13題不要用通分做 就兩邊同乘6!然後慢慢析出會比12/01 11:36
7F→:較快唷12/01 11:36
2F推:題目是不是有錯???03/04 00:57
4F推:這題簡單 上下同乘sqrt(1+tanx) + sqrt(1+sinx)然後02/10 17:24
5F→:(tanx-sinx)/x^3=1/2 後面那邊就定形帶入算值02/10 17:25
5F→:不用醬算 列一條式子就可以了03/11 17:11
6F推:x^2=(5-x)(5+x) 去求x是多少在乘兩倍吧03/11 17:14
7F→:因為他說內接正方形 圓心一定把正方形的每邊長平分03/11 17:15
8F→:然後以前有學過圓內接十字型的公式就可以算出來了03/11 17:17
9F→:這條題目都沒用到正三角形 感覺沒出得很好...03/11 17:19
21F推:題目不是內接一個正方形嗎???03/11 20:39
22F推:喔喔 差不多之道你意思了 不過如果是圓內接正方形03/11 20:43
23F→:那就會把正方形邊長平分 我不知道為什S飛說是錯03/11 20:44
2F推:5根號2吧03/11 17:10
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