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𝒂𝒙𝟐
+ 𝒃𝒙 + 𝒄 = 𝟎
The quadratic equation is
written in the standard form
∎ 𝒂 ≠ 𝟎
∎ 𝒂, 𝒃, 𝒄 𝝐 𝑹
𝑹 = 𝒓𝒆𝒂𝒍 𝒏𝒖𝒎𝒃𝒆𝒓𝒔
𝒙 = ?
分解法 𝒑𝒈 𝟑
𝒑𝒈 𝟓 公式法 𝒑𝒈 𝟕
分解法 𝒑𝒈 𝟑
𝟏. 𝟐𝒙𝟐
+ 𝟕𝒙 − 𝟏𝟓 = 𝟎
𝒂𝒙𝟐 + 𝒃𝒙 + 𝒄 = 𝟎
𝟐𝒙 − 𝟑 𝒙 + 𝟓 = 𝟎
𝟐𝒙 − 𝟑 = 𝟎
𝒙 =
𝟑
𝟐
或 𝒙 + 𝟓 = 𝟎
𝒙 = −𝟓
∴ 𝒙 = −𝟓 ,
𝟑
𝟐
𝟐. 𝒙𝟐 − 𝟔𝒙 + 𝟗 = 𝟎
𝒙 − 𝟑 𝟐 = 𝟎
𝒙 = 𝟑
∴ 解集 = 𝟑
解集
分解法 𝒑𝒈 𝟒
𝟑. 𝟗𝒙𝟐
− 𝟐𝟓 = 𝟎
𝒂𝒙𝟐 + 𝒃𝒙 + 𝒄 = 𝟎
𝟑𝒙 + 𝟓 𝟑𝒙 − 𝟓 = 𝟎
𝟑𝒙 + 𝟓 = 𝟎
𝒙 = −
𝟓
𝟑
或 𝟑𝒙 − 𝟓 = 𝟎
∴ 𝒙 = ±
𝟓
𝟑
𝟒. 𝟑𝒙 − 𝟐 𝟐𝒙 − 𝟑 = −𝟏
𝟔𝒙𝟐 − 𝟗𝒙 − 𝟒𝒙 + 𝟔 + 𝟏 = 𝟎
𝟔𝒙𝟐 − 𝟏𝟑𝒙 + 𝟕 = 𝟎
∴ 解集 = 𝟏 ,
𝟕
𝟔
解集
𝒙 =
𝟓
𝟑
𝒙 − 𝟏 (𝟔𝒙 − 𝟕) = 𝟎
𝒙 = 𝟏
𝒙 − 𝟏 = 𝟎 或 𝟔𝒙 − 𝟕 = 𝟎
𝒙 =
𝟕
𝟔
分解法 𝒑𝒈 𝟒
𝒂𝒙𝟐 + 𝒃𝒙 + 𝒄 = 𝟎
𝒙 = 𝟎 或 𝒙 − 𝟑 = 𝟎
∴ 𝒙 = 0 , 3
𝟓. 𝒙 + 𝟐 𝒙 − 𝟑 = 𝟐 𝒙 − 𝟑
𝒙𝟐 − 𝟑𝒙 = 𝟎
𝒙𝟐
− 𝟑𝒙 + 𝟐𝒙 − 𝟔 = 𝟐𝒙 − 𝟔
𝒙 = 𝟑
𝒙(𝒙 − 𝟑) = 𝟎
𝒙 + 𝟐 𝒙 − 𝟑 − 𝟐 𝒙 − 𝟑 = 𝟎
(𝒙 − 𝟑)(𝒙 + 𝟐 − 𝟐) = 𝟎
𝒙 − 𝟑 𝒙 = 𝟎
分解法 𝒑𝒈 𝟓
𝒂𝒙𝟐 + 𝒃𝒙 + 𝒄 = 𝟎
𝟏. 𝒙𝟐
− 𝟐𝒙 − 𝟑𝟓 = 𝟎
𝟐. 𝟒𝒙𝟐
+ 𝟏𝟑𝒙 + 𝟑 = 𝟎
𝟑. 𝟗𝒙𝟐 − 𝟏𝟖𝒙 = 𝟎
𝟒. 𝟒𝒙𝟐
= 𝟏𝟐𝒙 − 𝟗
𝒙 = −𝟓 , 7
𝒙 = −3 , −
𝟏
𝟒
𝒙 = 𝟎 , 2
𝒙 =
𝟑
𝟐
分解法 𝒑𝒈 𝟗
𝟏. 𝒙 − 𝟑 𝟐 = 𝟐𝟓
𝟐. 𝒙 + 𝟏 𝒙 + 𝟐 = 𝟑𝟎
𝟒. 𝒙𝟐 +
𝟏
𝟒
= 𝒙
𝒙 = −2 , 8
𝒙 = −7 , 𝟒
𝒙 = −
𝟏
𝟐
, 3
𝒙 =
𝟏
𝟐
𝒂𝒙𝟐 + 𝒃𝒙 + 𝒄 = 𝟎
𝟑. 𝟐𝒙 + 𝟏 𝟐
= 𝟕 𝟐𝒙 + 𝟏
𝟓. 𝟑𝒙𝟐 + 𝟓 = 𝟖𝒙 𝒙 = 1 ,
𝟓
𝟑
𝒙 −
𝟏
𝟐
𝟐
= 𝒙𝟐 − 𝒙 +
𝟏
𝟒
𝒙 = ?
分解法 𝒑𝒈 𝟑
𝒑𝒈 𝟓 公式法 𝒑𝒈 𝟕
𝒑𝒈 𝟓 𝟔. 𝒙𝟐
+ 𝟑𝒙 − 𝟒 = 𝟎
𝒙𝟐 + 𝟑𝒙 = 𝟒
𝒙𝟐
+ 𝟑𝒙 +
𝟑
𝟐
𝟐
= 𝟒 +
𝟑
𝟐
𝟐
𝒙 +
𝟑
𝟐
𝟐
= 𝟒 +
𝟑
𝟐
𝟐
𝒙 +
𝟑
𝟐
= ±
𝟐𝟓
𝟒
𝒙 = −
𝟑
𝟐
±
𝟓
𝟐
𝒙 = 𝟏 或 𝒙 = −𝟒
∴ 𝒙 = − 4 , 1
𝒑𝒈 𝟔 𝟕. 𝟑𝒙𝟐
− 𝟒𝒙 − 𝟐 = 𝟎
𝒙𝟐 −
𝟒
𝟑
𝒙 −
𝟐
𝟑
= 𝟎
𝒙 −
𝟐
𝟑
= ±
𝟏𝟎
𝟗
𝒙 =
𝟐
𝟑
±
𝟏𝟎
𝟑
𝒙𝟐 −
𝟒
𝟑
𝒙 =
𝟐
𝟑
𝒙𝟐 −
𝟒
𝟑
𝒙 +
𝟐
𝟑
𝟐
=
𝟐
𝟑
+
𝟐
𝟑
𝟐
解集
∴ 解集 =
𝟐
𝟑
+
𝟏𝟎
𝟑
,
𝟐
𝟑
−
𝟏𝟎
𝟑
𝒑𝒈 𝟔
𝟏. 𝒙𝟐 − 𝟗𝒙 + 𝟏𝟒 = 𝟎
𝟐. 𝒙𝟐
− 𝟐𝒙 − 𝟒 = 𝟎
𝟑. 𝟑𝒙𝟐 − 𝟏𝟕𝒙 + 𝟐𝟎 = 𝟎
𝒙 = 𝟐 , 7
𝒙 = 𝟏 ± 𝟓
𝒙 =
𝟓
𝟑
, 4
𝒙 = −
𝟒
𝟑
,
𝟓
𝟐
𝟒. 𝟔𝒙𝟐 − 𝟕𝒙 − 𝟐𝟎 = 𝟎
𝒑𝒈 𝟔
∴ 𝒙 =
𝟓
𝟑
, 4
𝟑. 𝟑𝒙𝟐
− 𝟏𝟕𝒙 + 𝟐𝟎 = 𝟎
𝒙𝟐 −
𝟏𝟕
𝟑
𝒙 +
𝟐𝟎
𝟑
= 𝟎
𝒙𝟐 −
𝟏𝟕
𝟑
𝒙 = −
𝟐𝟎
𝟑
𝒙𝟐
−
𝟏𝟕
𝟑
𝒙 +
𝟏𝟕
𝟔
𝟐
= −
𝟐𝟎
𝟑
+
𝟏𝟕
𝟔
𝟐
𝒙 −
𝟏𝟕
𝟔
= ±
−𝟐𝟒𝟎 + 𝟐𝟖𝟗
𝟑𝟔
𝒙 =
𝟏𝟕
𝟔
±
𝟕
𝟔
𝒑𝒈 𝟗
𝟔. 𝟐𝒙 − 𝟏 𝒙 − 𝟐 = 𝟓
𝟖. 𝟒𝒙𝟐 − 𝟐𝟔𝒙 + 𝟐𝟐 = 𝟎
𝒙 = −
𝟏
𝟐
, 3
𝒙 = −𝟔 , 𝟒
𝒙 = 1 ,
𝟏𝟏
𝟐
𝒙 = −
𝟐
𝟑
,
𝟑
𝟐
𝟗. 𝟔𝒙𝟐 = 𝟓𝒙 + 𝟔
𝟕. 𝒙 + 𝟖 𝒙 − 𝟑 = 𝟑𝒙
𝟏𝟎. 𝒙𝟐 − 𝒙 − 𝟔𝟒 = 𝟎 𝒙 =
𝟏 ± 𝟐𝟓𝟕
𝟐
𝒑𝒈 𝟗
∴ 𝒙 = 1 ,
𝟏𝟏
𝟐
𝒙𝟐 −
𝟐𝟔
𝟒
𝒙 +
𝟐𝟐
𝟒
= 𝟎
𝒙𝟐
−
𝟏𝟑
𝟐
𝒙 = −
𝟐𝟐
𝟒
𝒙𝟐 −
𝟏𝟑
𝟐
𝒙 +
𝟏𝟑
𝟒
𝟐
= −
𝟐𝟐
𝟒
+
𝟏𝟑
𝟒
𝟐
𝒙 −
𝟏𝟑
𝟒
= ±
−𝟖𝟖 + 𝟏𝟔𝟗
𝟏𝟔
𝒙 =
𝟏𝟑
𝟒
±
𝟗
𝟒
𝟖. 𝟒𝒙𝟐 − 𝟐𝟔𝒙 + 𝟐𝟐 = 𝟎
𝒑𝒈 𝟗
𝒙𝟐
− 𝒙 = 𝟔𝟒
𝒙𝟐 − 𝒙 +
𝟏
𝟐
𝟐
= 𝟔𝟒 +
𝟏
𝟐
𝟐
𝒙 −
𝟏
𝟐
= ±
𝟐𝟓𝟔 + 𝟏
𝟒
𝒙 =
𝟏
𝟐
±
𝟐𝟓𝟕
𝟐
𝟏𝟎. 𝒙𝟐 − 𝒙 − 𝟔𝟒 = 𝟎
∴ 𝒙 =
𝟏 ± 𝟐𝟓𝟕
𝟐
𝒙 = ?
分解法 𝒑𝒈 𝟑
𝒑𝒈 𝟓 公式法 𝒑𝒈 𝟕
公式法 𝒑𝒈 𝟕, 𝟖
𝟖. 𝒙𝟐 + 𝟑𝒙 + 𝟏 = 𝟎
𝒙 =
−𝒃 ± 𝒃𝟐 − 𝟒𝒂𝒄
𝟐𝒂
𝒂𝒙𝟐 + 𝒃𝒙 + 𝒄 = 𝟎
𝐚 = 𝟏
𝒃 = 𝟑
𝐜 = 𝟏
𝒙 =
−𝟑 ± 𝟑𝟐 − 𝟒 𝟏 𝟏
𝟐 𝟏
𝒙 =
−𝟑 ± 𝟓
𝟐
𝟗. 𝟓𝒙𝟐 + 𝟏𝟑𝒙 = 𝟒𝟔
𝐚 = 𝟓
𝒃 = 𝟏𝟑
𝐜 = −𝟒𝟔
=
−𝟏𝟑 ± 𝟏𝟑𝟐 − 𝟒 𝟓 −𝟒𝟔
𝟐 𝟓
=
−𝟏𝟑 ± 𝟑𝟑
𝟏𝟎
𝒂𝒙𝟐 + 𝒃𝒙 + 𝒄 = 𝟎
𝟓𝒙𝟐
+ 𝟏𝟑𝒙 − 𝟒𝟔 = 𝟎
𝒙 =
−𝒃 ± 𝒃𝟐 − 𝟒𝒂𝒄
𝟐𝒂
∴ 𝒙 = 𝟐 , −
𝟐𝟑
𝟓
公式法 𝒑𝒈 𝟖
𝒂𝒙𝟐 + 𝒃𝒙 + 𝒄 = 𝟎
𝟏. 𝟗𝒙𝟐 + 𝟔𝒙 + 𝟏 = 𝟎
𝟐. 𝟏𝟐𝒙𝟐 − 𝟐𝟓𝒙 + 𝟏𝟐 = 𝟎
𝟑. 𝟗𝒙𝟐
= 𝟏𝟏 + 𝟏𝟖𝒙
𝒙 = −
𝟏
𝟑
𝒙 =
𝟑
𝟒
,
𝟒
𝟑
𝒙 =
𝟑 ± 𝟐 𝟓
𝟑
𝒙 =
−𝒃 ± 𝒃𝟐 − 𝟒𝒂𝒄
𝟐𝒂
公式法 𝒑𝒈 𝟗
𝟏𝟏. 𝒙 − 𝟏 𝟐
+ 𝒙 + 𝟑 𝟐
= 𝟐𝟔
𝟏𝟐. 𝟐𝒙 − 𝟏 𝟑𝒙 + 𝟏 = 𝟒
𝟏𝟑. 𝟏𝟒𝒙𝟐 + 𝟗𝒙 − 𝟔𝟓 = 𝟎
𝒙 = −𝟒 , 𝟐
𝒙 = −
𝟓
𝟔
, 𝟏
𝒙 = −
𝟓
𝟐
,
𝟏𝟑
𝟕
𝟏𝟒. 𝟑𝒙 + 𝟔 𝟐 = 𝟏
𝟏𝟓. 𝒙 + 𝟏 𝒙 + 𝟑 = 𝟒
𝒙 = −
𝟖
𝟑
, −𝟐
𝒙 = −𝟐 ± 𝟓
迼当方法 𝒑𝒈 𝟗 𝟏𝟔. 𝟐𝒙𝟐 − 𝒙 − 𝟐𝟏 = 𝟎 解集 = −𝟑 ,
𝟕
𝟐
𝟏𝟗. 𝒙 𝒙 + 𝟑 = 𝟔𝒙 − 𝟐
解集
𝟏𝟕. 𝒙𝟐 − 𝟒𝒙 − 𝟔 = 𝟎
𝟏𝟖. 𝟐𝒙𝟐 + 𝟔 = 𝟕𝒙
𝟐𝟎. 𝟐𝒙𝟐 − 𝒙 𝟓 − 𝒙 = 𝟐
𝟐𝟏. 𝒙 − 𝟖 = −
𝟑𝒙𝟐
𝟐
𝟐𝟐. 𝒙 𝟔𝒙 + 𝟏 = 𝟑𝟓
𝟐𝟑. 𝟐𝒙 𝒙 − 𝟒 = 𝟔 − 𝟒𝒙
解集 = 𝟐 ± 𝟏𝟎
解集 =
𝟑
𝟐
, 𝟐
解集 =
𝟑 ± 𝟏𝟕
𝟐
解集 = −
𝟏
𝟑
, 𝟐
解集 = −
𝟖
𝟑
, 𝟐
解集 = −
𝟕
𝟑
,
𝟓
𝟐
解集 = 𝟏 , 𝟑
𝒂 = 𝟏
𝒃 = − 𝟒
𝐜 = − 𝟔
𝒙 =
𝟒 ± 𝟏𝟔 − 𝟒 𝟏 −𝟔
𝟐 𝟏
=
𝟒 ± 𝟒𝟎
𝟐
𝒂 = 𝟑
𝒃 = 𝟐
𝐜 = − 𝟏𝟔
=
−𝟐 ± 𝟏𝟗𝟔
𝟔
=
−𝟐 ± 𝟏𝟒
𝟔
𝒂𝒙𝟐
+ 𝒃𝒙 + 𝒄 = 𝟎
𝟑𝒙𝟐 + 𝟐𝒙 − 𝟏𝟔 = 𝟎
𝒙 =
−𝟐 ± 𝟐𝟐 − 𝟒 𝟑 −𝟏𝟔
𝟐 𝟑
𝟏𝟕. 𝒙𝟐
− 𝟒𝒙 − 𝟔 = 𝟎
迼当方法 𝒑𝒈 𝟗
解集
∴ 解集 = 𝟐 ± 𝟏𝟎
=
𝟒 ± 𝟐 𝟏𝟎
𝟐
𝒙 =
−𝒃 ± 𝒃𝟐 − 𝟒𝒂𝒄
𝟐𝒂
= 𝟐 ± 𝟏𝟎
𝟐𝟏. 𝒙 − 𝟖 = −
𝟑𝒙𝟐
𝟐
∴ 解集 = −
𝟖
𝟑
, 𝟐

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SUEC 高中 Adv Maths (Quadratic Equation in One Variable)

  • 1. 𝒂𝒙𝟐 + 𝒃𝒙 + 𝒄 = 𝟎 The quadratic equation is written in the standard form ∎ 𝒂 ≠ 𝟎 ∎ 𝒂, 𝒃, 𝒄 𝝐 𝑹 𝑹 = 𝒓𝒆𝒂𝒍 𝒏𝒖𝒎𝒃𝒆𝒓𝒔
  • 2. 𝒙 = ? 分解法 𝒑𝒈 𝟑 𝒑𝒈 𝟓 公式法 𝒑𝒈 𝟕
  • 3. 分解法 𝒑𝒈 𝟑 𝟏. 𝟐𝒙𝟐 + 𝟕𝒙 − 𝟏𝟓 = 𝟎 𝒂𝒙𝟐 + 𝒃𝒙 + 𝒄 = 𝟎 𝟐𝒙 − 𝟑 𝒙 + 𝟓 = 𝟎 𝟐𝒙 − 𝟑 = 𝟎 𝒙 = 𝟑 𝟐 或 𝒙 + 𝟓 = 𝟎 𝒙 = −𝟓 ∴ 𝒙 = −𝟓 , 𝟑 𝟐 𝟐. 𝒙𝟐 − 𝟔𝒙 + 𝟗 = 𝟎 𝒙 − 𝟑 𝟐 = 𝟎 𝒙 = 𝟑 ∴ 解集 = 𝟑 解集
  • 4. 分解法 𝒑𝒈 𝟒 𝟑. 𝟗𝒙𝟐 − 𝟐𝟓 = 𝟎 𝒂𝒙𝟐 + 𝒃𝒙 + 𝒄 = 𝟎 𝟑𝒙 + 𝟓 𝟑𝒙 − 𝟓 = 𝟎 𝟑𝒙 + 𝟓 = 𝟎 𝒙 = − 𝟓 𝟑 或 𝟑𝒙 − 𝟓 = 𝟎 ∴ 𝒙 = ± 𝟓 𝟑 𝟒. 𝟑𝒙 − 𝟐 𝟐𝒙 − 𝟑 = −𝟏 𝟔𝒙𝟐 − 𝟗𝒙 − 𝟒𝒙 + 𝟔 + 𝟏 = 𝟎 𝟔𝒙𝟐 − 𝟏𝟑𝒙 + 𝟕 = 𝟎 ∴ 解集 = 𝟏 , 𝟕 𝟔 解集 𝒙 = 𝟓 𝟑 𝒙 − 𝟏 (𝟔𝒙 − 𝟕) = 𝟎 𝒙 = 𝟏 𝒙 − 𝟏 = 𝟎 或 𝟔𝒙 − 𝟕 = 𝟎 𝒙 = 𝟕 𝟔
  • 5. 分解法 𝒑𝒈 𝟒 𝒂𝒙𝟐 + 𝒃𝒙 + 𝒄 = 𝟎 𝒙 = 𝟎 或 𝒙 − 𝟑 = 𝟎 ∴ 𝒙 = 0 , 3 𝟓. 𝒙 + 𝟐 𝒙 − 𝟑 = 𝟐 𝒙 − 𝟑 𝒙𝟐 − 𝟑𝒙 = 𝟎 𝒙𝟐 − 𝟑𝒙 + 𝟐𝒙 − 𝟔 = 𝟐𝒙 − 𝟔 𝒙 = 𝟑 𝒙(𝒙 − 𝟑) = 𝟎 𝒙 + 𝟐 𝒙 − 𝟑 − 𝟐 𝒙 − 𝟑 = 𝟎 (𝒙 − 𝟑)(𝒙 + 𝟐 − 𝟐) = 𝟎 𝒙 − 𝟑 𝒙 = 𝟎
  • 6. 分解法 𝒑𝒈 𝟓 𝒂𝒙𝟐 + 𝒃𝒙 + 𝒄 = 𝟎 𝟏. 𝒙𝟐 − 𝟐𝒙 − 𝟑𝟓 = 𝟎 𝟐. 𝟒𝒙𝟐 + 𝟏𝟑𝒙 + 𝟑 = 𝟎 𝟑. 𝟗𝒙𝟐 − 𝟏𝟖𝒙 = 𝟎 𝟒. 𝟒𝒙𝟐 = 𝟏𝟐𝒙 − 𝟗 𝒙 = −𝟓 , 7 𝒙 = −3 , − 𝟏 𝟒 𝒙 = 𝟎 , 2 𝒙 = 𝟑 𝟐
  • 7. 分解法 𝒑𝒈 𝟗 𝟏. 𝒙 − 𝟑 𝟐 = 𝟐𝟓 𝟐. 𝒙 + 𝟏 𝒙 + 𝟐 = 𝟑𝟎 𝟒. 𝒙𝟐 + 𝟏 𝟒 = 𝒙 𝒙 = −2 , 8 𝒙 = −7 , 𝟒 𝒙 = − 𝟏 𝟐 , 3 𝒙 = 𝟏 𝟐 𝒂𝒙𝟐 + 𝒃𝒙 + 𝒄 = 𝟎 𝟑. 𝟐𝒙 + 𝟏 𝟐 = 𝟕 𝟐𝒙 + 𝟏 𝟓. 𝟑𝒙𝟐 + 𝟓 = 𝟖𝒙 𝒙 = 1 , 𝟓 𝟑 𝒙 − 𝟏 𝟐 𝟐 = 𝒙𝟐 − 𝒙 + 𝟏 𝟒
  • 8. 𝒙 = ? 分解法 𝒑𝒈 𝟑 𝒑𝒈 𝟓 公式法 𝒑𝒈 𝟕
  • 9. 𝒑𝒈 𝟓 𝟔. 𝒙𝟐 + 𝟑𝒙 − 𝟒 = 𝟎 𝒙𝟐 + 𝟑𝒙 = 𝟒 𝒙𝟐 + 𝟑𝒙 + 𝟑 𝟐 𝟐 = 𝟒 + 𝟑 𝟐 𝟐 𝒙 + 𝟑 𝟐 𝟐 = 𝟒 + 𝟑 𝟐 𝟐 𝒙 + 𝟑 𝟐 = ± 𝟐𝟓 𝟒 𝒙 = − 𝟑 𝟐 ± 𝟓 𝟐 𝒙 = 𝟏 或 𝒙 = −𝟒 ∴ 𝒙 = − 4 , 1
  • 10. 𝒑𝒈 𝟔 𝟕. 𝟑𝒙𝟐 − 𝟒𝒙 − 𝟐 = 𝟎 𝒙𝟐 − 𝟒 𝟑 𝒙 − 𝟐 𝟑 = 𝟎 𝒙 − 𝟐 𝟑 = ± 𝟏𝟎 𝟗 𝒙 = 𝟐 𝟑 ± 𝟏𝟎 𝟑 𝒙𝟐 − 𝟒 𝟑 𝒙 = 𝟐 𝟑 𝒙𝟐 − 𝟒 𝟑 𝒙 + 𝟐 𝟑 𝟐 = 𝟐 𝟑 + 𝟐 𝟑 𝟐 解集 ∴ 解集 = 𝟐 𝟑 + 𝟏𝟎 𝟑 , 𝟐 𝟑 − 𝟏𝟎 𝟑
  • 11. 𝒑𝒈 𝟔 𝟏. 𝒙𝟐 − 𝟗𝒙 + 𝟏𝟒 = 𝟎 𝟐. 𝒙𝟐 − 𝟐𝒙 − 𝟒 = 𝟎 𝟑. 𝟑𝒙𝟐 − 𝟏𝟕𝒙 + 𝟐𝟎 = 𝟎 𝒙 = 𝟐 , 7 𝒙 = 𝟏 ± 𝟓 𝒙 = 𝟓 𝟑 , 4 𝒙 = − 𝟒 𝟑 , 𝟓 𝟐 𝟒. 𝟔𝒙𝟐 − 𝟕𝒙 − 𝟐𝟎 = 𝟎
  • 12. 𝒑𝒈 𝟔 ∴ 𝒙 = 𝟓 𝟑 , 4 𝟑. 𝟑𝒙𝟐 − 𝟏𝟕𝒙 + 𝟐𝟎 = 𝟎 𝒙𝟐 − 𝟏𝟕 𝟑 𝒙 + 𝟐𝟎 𝟑 = 𝟎 𝒙𝟐 − 𝟏𝟕 𝟑 𝒙 = − 𝟐𝟎 𝟑 𝒙𝟐 − 𝟏𝟕 𝟑 𝒙 + 𝟏𝟕 𝟔 𝟐 = − 𝟐𝟎 𝟑 + 𝟏𝟕 𝟔 𝟐 𝒙 − 𝟏𝟕 𝟔 = ± −𝟐𝟒𝟎 + 𝟐𝟖𝟗 𝟑𝟔 𝒙 = 𝟏𝟕 𝟔 ± 𝟕 𝟔
  • 13. 𝒑𝒈 𝟗 𝟔. 𝟐𝒙 − 𝟏 𝒙 − 𝟐 = 𝟓 𝟖. 𝟒𝒙𝟐 − 𝟐𝟔𝒙 + 𝟐𝟐 = 𝟎 𝒙 = − 𝟏 𝟐 , 3 𝒙 = −𝟔 , 𝟒 𝒙 = 1 , 𝟏𝟏 𝟐 𝒙 = − 𝟐 𝟑 , 𝟑 𝟐 𝟗. 𝟔𝒙𝟐 = 𝟓𝒙 + 𝟔 𝟕. 𝒙 + 𝟖 𝒙 − 𝟑 = 𝟑𝒙 𝟏𝟎. 𝒙𝟐 − 𝒙 − 𝟔𝟒 = 𝟎 𝒙 = 𝟏 ± 𝟐𝟓𝟕 𝟐
  • 14. 𝒑𝒈 𝟗 ∴ 𝒙 = 1 , 𝟏𝟏 𝟐 𝒙𝟐 − 𝟐𝟔 𝟒 𝒙 + 𝟐𝟐 𝟒 = 𝟎 𝒙𝟐 − 𝟏𝟑 𝟐 𝒙 = − 𝟐𝟐 𝟒 𝒙𝟐 − 𝟏𝟑 𝟐 𝒙 + 𝟏𝟑 𝟒 𝟐 = − 𝟐𝟐 𝟒 + 𝟏𝟑 𝟒 𝟐 𝒙 − 𝟏𝟑 𝟒 = ± −𝟖𝟖 + 𝟏𝟔𝟗 𝟏𝟔 𝒙 = 𝟏𝟑 𝟒 ± 𝟗 𝟒 𝟖. 𝟒𝒙𝟐 − 𝟐𝟔𝒙 + 𝟐𝟐 = 𝟎
  • 15. 𝒑𝒈 𝟗 𝒙𝟐 − 𝒙 = 𝟔𝟒 𝒙𝟐 − 𝒙 + 𝟏 𝟐 𝟐 = 𝟔𝟒 + 𝟏 𝟐 𝟐 𝒙 − 𝟏 𝟐 = ± 𝟐𝟓𝟔 + 𝟏 𝟒 𝒙 = 𝟏 𝟐 ± 𝟐𝟓𝟕 𝟐 𝟏𝟎. 𝒙𝟐 − 𝒙 − 𝟔𝟒 = 𝟎 ∴ 𝒙 = 𝟏 ± 𝟐𝟓𝟕 𝟐
  • 16. 𝒙 = ? 分解法 𝒑𝒈 𝟑 𝒑𝒈 𝟓 公式法 𝒑𝒈 𝟕
  • 17. 公式法 𝒑𝒈 𝟕, 𝟖 𝟖. 𝒙𝟐 + 𝟑𝒙 + 𝟏 = 𝟎 𝒙 = −𝒃 ± 𝒃𝟐 − 𝟒𝒂𝒄 𝟐𝒂 𝒂𝒙𝟐 + 𝒃𝒙 + 𝒄 = 𝟎 𝐚 = 𝟏 𝒃 = 𝟑 𝐜 = 𝟏 𝒙 = −𝟑 ± 𝟑𝟐 − 𝟒 𝟏 𝟏 𝟐 𝟏 𝒙 = −𝟑 ± 𝟓 𝟐 𝟗. 𝟓𝒙𝟐 + 𝟏𝟑𝒙 = 𝟒𝟔 𝐚 = 𝟓 𝒃 = 𝟏𝟑 𝐜 = −𝟒𝟔 = −𝟏𝟑 ± 𝟏𝟑𝟐 − 𝟒 𝟓 −𝟒𝟔 𝟐 𝟓 = −𝟏𝟑 ± 𝟑𝟑 𝟏𝟎 𝒂𝒙𝟐 + 𝒃𝒙 + 𝒄 = 𝟎 𝟓𝒙𝟐 + 𝟏𝟑𝒙 − 𝟒𝟔 = 𝟎 𝒙 = −𝒃 ± 𝒃𝟐 − 𝟒𝒂𝒄 𝟐𝒂 ∴ 𝒙 = 𝟐 , − 𝟐𝟑 𝟓
  • 18. 公式法 𝒑𝒈 𝟖 𝒂𝒙𝟐 + 𝒃𝒙 + 𝒄 = 𝟎 𝟏. 𝟗𝒙𝟐 + 𝟔𝒙 + 𝟏 = 𝟎 𝟐. 𝟏𝟐𝒙𝟐 − 𝟐𝟓𝒙 + 𝟏𝟐 = 𝟎 𝟑. 𝟗𝒙𝟐 = 𝟏𝟏 + 𝟏𝟖𝒙 𝒙 = − 𝟏 𝟑 𝒙 = 𝟑 𝟒 , 𝟒 𝟑 𝒙 = 𝟑 ± 𝟐 𝟓 𝟑 𝒙 = −𝒃 ± 𝒃𝟐 − 𝟒𝒂𝒄 𝟐𝒂
  • 19. 公式法 𝒑𝒈 𝟗 𝟏𝟏. 𝒙 − 𝟏 𝟐 + 𝒙 + 𝟑 𝟐 = 𝟐𝟔 𝟏𝟐. 𝟐𝒙 − 𝟏 𝟑𝒙 + 𝟏 = 𝟒 𝟏𝟑. 𝟏𝟒𝒙𝟐 + 𝟗𝒙 − 𝟔𝟓 = 𝟎 𝒙 = −𝟒 , 𝟐 𝒙 = − 𝟓 𝟔 , 𝟏 𝒙 = − 𝟓 𝟐 , 𝟏𝟑 𝟕 𝟏𝟒. 𝟑𝒙 + 𝟔 𝟐 = 𝟏 𝟏𝟓. 𝒙 + 𝟏 𝒙 + 𝟑 = 𝟒 𝒙 = − 𝟖 𝟑 , −𝟐 𝒙 = −𝟐 ± 𝟓
  • 20. 迼当方法 𝒑𝒈 𝟗 𝟏𝟔. 𝟐𝒙𝟐 − 𝒙 − 𝟐𝟏 = 𝟎 解集 = −𝟑 , 𝟕 𝟐 𝟏𝟗. 𝒙 𝒙 + 𝟑 = 𝟔𝒙 − 𝟐 解集 𝟏𝟕. 𝒙𝟐 − 𝟒𝒙 − 𝟔 = 𝟎 𝟏𝟖. 𝟐𝒙𝟐 + 𝟔 = 𝟕𝒙 𝟐𝟎. 𝟐𝒙𝟐 − 𝒙 𝟓 − 𝒙 = 𝟐 𝟐𝟏. 𝒙 − 𝟖 = − 𝟑𝒙𝟐 𝟐 𝟐𝟐. 𝒙 𝟔𝒙 + 𝟏 = 𝟑𝟓 𝟐𝟑. 𝟐𝒙 𝒙 − 𝟒 = 𝟔 − 𝟒𝒙 解集 = 𝟐 ± 𝟏𝟎 解集 = 𝟑 𝟐 , 𝟐 解集 = 𝟑 ± 𝟏𝟕 𝟐 解集 = − 𝟏 𝟑 , 𝟐 解集 = − 𝟖 𝟑 , 𝟐 解集 = − 𝟕 𝟑 , 𝟓 𝟐 解集 = 𝟏 , 𝟑
  • 21. 𝒂 = 𝟏 𝒃 = − 𝟒 𝐜 = − 𝟔 𝒙 = 𝟒 ± 𝟏𝟔 − 𝟒 𝟏 −𝟔 𝟐 𝟏 = 𝟒 ± 𝟒𝟎 𝟐 𝒂 = 𝟑 𝒃 = 𝟐 𝐜 = − 𝟏𝟔 = −𝟐 ± 𝟏𝟗𝟔 𝟔 = −𝟐 ± 𝟏𝟒 𝟔 𝒂𝒙𝟐 + 𝒃𝒙 + 𝒄 = 𝟎 𝟑𝒙𝟐 + 𝟐𝒙 − 𝟏𝟔 = 𝟎 𝒙 = −𝟐 ± 𝟐𝟐 − 𝟒 𝟑 −𝟏𝟔 𝟐 𝟑 𝟏𝟕. 𝒙𝟐 − 𝟒𝒙 − 𝟔 = 𝟎 迼当方法 𝒑𝒈 𝟗 解集 ∴ 解集 = 𝟐 ± 𝟏𝟎 = 𝟒 ± 𝟐 𝟏𝟎 𝟐 𝒙 = −𝒃 ± 𝒃𝟐 − 𝟒𝒂𝒄 𝟐𝒂 = 𝟐 ± 𝟏𝟎 𝟐𝟏. 𝒙 − 𝟖 = − 𝟑𝒙𝟐 𝟐 ∴ 解集 = − 𝟖 𝟑 , 𝟐