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每日一题_椭圆与直线_人教A选必一习题3.1第11题(教材116页)

每日一题_椭圆与直线_人教A选必一习题3.1第11题(教材116页)
  1. 如图,矩形  中, ()。 分别是矩形四条边的中点, 是线段  的四等分点, 是线段  的四等分点。证明直线  与  与  与  的交点  都在椭圆  () 上。

📐 方法一:联立三个方程组(基础通法)

思路: 最朴素的解析几何方法,暴力求解,步步为营。

  1. 建立坐标系:以矩形中心为原点, 所在直线为  轴。

  2. 求交点

    • 直线 :过  和 ,方程为 
    • 直线 :过  和 ,斜率 ,方程为 
    • 联立解得:
  3. 求交点

    • 直线 
    • 直线 :斜率 ,方程 
    • 联立解得:
  4. 求交点

    • 直线 
    • 直线 :斜率 ,方程 
    • 联立解得:
  5. 验证

    • 将三点坐标代入 ,结果均为 1,得证。

🔍 方法二:类比观察法(结构同构)

思路: 算出  后,观察  的坐标结构,利用对称性快速得出结论。

  1. 计算:同方法一,解得 

    • 观察发现: (这里  对应  的分母)。
    • 更直观地看: 的形式(其中  与斜率有关)。
  2. 类比推导

    • 对于 ,直线  的斜率是  的 2 倍(因为  是  的 2 倍远)。
    • 设  斜率对应参数 ,则  对应 
    • 直接观察  的坐标结构:(取绝对值或调整符号)。
    • 同理  对应参数 (因为  是  的 3 倍远):(需修正,实际是 ,对应参数  或类似关系)。
    • 修正观察:直接看坐标数值。 对应勾股数  对应  对应 
    • 这三组都是勾股数,必然满足 (在单位圆下),映射到椭圆即满足方程。
  3. 结论:由类比可知,三点坐标均满足椭圆方程。


📐 方法三:斜率关系法(几何性质)

思路: 利用直线  和  的斜率乘积为定值(或特定关系)来解题。

  1. 设斜率

    • 设直线  的斜率为 。因为 ,所以 
    • 设直线  的斜率为 。因为 ,所以 
  2. 寻找  关系

    •  在  轴上,令  得 
    •  在  上,令  得 
    • 由题意, 和  是对应的四等分点。
    •  分  为 ,故 ,即 
    •  分  为 (从  往下),故 ?不对, 到  是  是第一个分点,
    • 代入  方程:
    • 关键关系
  3. 求交点轨迹

    • 联立 ,消去  得 
    • 消去参数 (利用 ),可推导出交点  满足 
    • 简略推导,结合  定值,可证。

⚖️ 方法四:截距对称法

思路: 观察直线在  轴上的截距互为相反数( 和 ),利用对称性。

  1. 设直线方程

  2. 利用四等分点关系

    •  的纵坐标是 ,代入  得 
    • 发现 
  3. 联立求解

    • 两式相加:
    • 两式相减:?不对,是 
    • 代入  解得 ,验证满足椭圆方程。

🌀 方法五:椭圆参数方程法(高阶思维)

思路: 设交点为椭圆上的点,反推其几何位置。

  1. 设点:设交点  在椭圆上,令 
  2. 连线 :
    • ,斜率 
    • 直线  与  轴交点  的横坐标 :令 ,得 
  3. 连线 :
    • ,斜率 
    • 直线  与  交点  的纵坐标 :令 ,得 
  4. 验证比例
    • 若  是 ,则  应为  的四等分点,即 
    • 解 
    • 解得 
    • 此时 ,正是点 
    • 同理可证 

📐 方法六:椭圆万能公式法(代数技巧)

思路: 利用万能公式  将三角函数转化为有理式。

  1. 公式回顾
  2. 设交点
  3. 求  坐标
    • 直线  过  和 
    • 令 ,解得  (经过化简)。
  4. 对应四等分点
    • 对于 
  5. 代回求 :
    • 得证。
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  1. CONNECT:[ UseTime:0.001370s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.002231s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.010516s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.007597s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001840s ]
  6. SELECT * FROM `set` [ RunTime:0.000866s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.002540s ]
  8. SELECT * FROM `article` WHERE `id` = 872916 LIMIT 1 [ RunTime:0.014064s ]
  9. UPDATE `article` SET `lasttime` = 1784817937 WHERE `id` = 872916 [ RunTime:0.041228s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.003455s ]
  11. SELECT * FROM `article` WHERE `id` < 872916 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.011607s ]
  12. SELECT * FROM `article` WHERE `id` > 872916 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.003324s ]
  13. SELECT * FROM `article` WHERE `id` < 872916 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.029629s ]
  14. SELECT * FROM `article` WHERE `id` < 872916 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.071091s ]
  15. SELECT * FROM `article` WHERE `id` < 872916 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002454s ]
0.401773s