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兩平面平行
⇒ 法向量平行
⇒ x, y, z 係數比例相同(可以直接設一樣)

設 E: 6x - 4y + 3z = k

x截距:(x, 0, 0) 代入 ⇒ x = k/6
y截距:(0, y, 0) 代入 ⇒ y = -k/4
z截距:(0, 0, z) 代入 ⇒ z = k/3
截距和 = k/6 - k/4 + k/3 = k/4 = 1

所以 k = 4
E 方程式為 6x - 4y + 3z - 4 = 0

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