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极简便方法,北大数学强基圆锥曲线笔试题

当前时间： 1970-01-01 08:00:00 分类：办公文件 评论(0)
极简便方法,北大数学强基圆锥曲线笔试题

极简便方法，北大数学强基圆锥曲线笔试题

两种方法，一种讲义中 38 页， 张直角弦中点轨迹，与椭圆联立，得出 c 点轨迹是个圆。半径大于 b，解得答案
第二种常规中点弦方。 直接设点的办法，再消元再联立化简，随后判别式Δ>0 第二个图给出，计算量很大

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辽宁,1小时前,
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  145. /yingpanguazai/ssd/ssd1/www/wwww.yeyulingfeng.com/vendor/topthink/think-trace/src/Html.php ( 4.42 KB )
  1. CONNECT:[ UseTime:0.000538s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000747s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.006888s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.004889s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000713s ]
  6. SELECT * FROM `set` [ RunTime:0.000699s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000601s ]
  8. SELECT * FROM `article` WHERE `id` = 843093 LIMIT 1 [ RunTime:0.003571s ]
  9. UPDATE `article` SET `lasttime` = 1783573228 WHERE `id` = 843093 [ RunTime:0.017146s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000361s ]
  11. SELECT * FROM `article` WHERE `id` < 843093 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000617s ]
  12. SELECT * FROM `article` WHERE `id` > 843093 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000634s ]
  13. SELECT * FROM `article` WHERE `id` < 843093 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.007029s ]
  14. SELECT * FROM `article` WHERE `id` < 843093 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.019836s ]
  15. SELECT * FROM `article` WHERE `id` < 843093 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.013776s ]
0.162138s