Choosen As Best Answer

垂直 x 軸 => x = 某個數字 => y 項係數 = 0

--> a = 0

L: 2x = 0, x = 0 --> y 軸

M: -x = 1, x = -1

﹋﹋﹋﹋﹋﹋﹋﹋﹋﹋﹋﹋﹋﹋﹋﹋

y = ax^2 + bx + c (1, 2)
=> a + b + c = 2

y = -1 為對稱軸 => 對稱點 (1, -4)
y = px^2 + qx + r
=> p + q + r = -4

(a + b + c) - (p + q + r) = 6

sky.

謝謝

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