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發問時間: 科學數學 · 6 年前

The coordinate of the point A

Thecoordinate of the point A

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7 個解答

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  • 6 年前
    最佳解答

    (a) Mid-pt of BC is (2.5, 6), therefore, the equation of the median passes through A is :

    (y - 3)/(x - 1) = (6 - 3)/(2.5 - 1)

    ==> y - 3 = 2x - 2

    ==> 2x - y + 1 = 0

    Mid-pt of AC is (4, 5.5), therefore, the equation of the median passes through B is :

    (y - 4)/(x + 2) = (5.5 - 4)/(4 + 2)

    ==> 4y - 16 = x + 2

    ==> x - 4y + 18 = 0

    (b) The intersection point of the medians is to solve these two equations :

    2x - y + 1 = 0 ⋯⋯⋯ (i)

    x - 4y + 18 = 0 ⋯⋯ (ii)

    (I) - 2*(ii), gets,

    7y - 35 = 0

    ==> y = 5

    Sub y = 5 into (I), gets x = 2

    As the centroid is the intersection point of the medians,

    Therefore, the centroid is (2, 5).

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  • 匿名使用者
    6 年前
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  • 匿名使用者
    6 年前

    到下面的網址看看吧

    ▶▶http://candy5660601.pixnet.net/blog

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  • 6 年前

    參考下面的網址看看

    http://phi008780520.pixnet.net/blog

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  • 6 年前

    參考下面的網址看看

    http://phi008780520.pixnet.net/blog

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  • 6 年前

    參考下面的網址看看

    http://phi008780520.pixnet.net/blog

    • Commenter avatar登入以對解答發表意見
  • 6 年前

    參考下面的網址看看

    http://phi008780520.pixnet.net/blog

    • Commenter avatar登入以對解答發表意見
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