[HKDSE maths] Quadratic equations in one unknown 一元二次方 程
係呢個課程我地會講下點樣透過不到方法，包活因式法(factor method)，配方法(Completing square)同埋二次公式(Quadratic formula)去解一元二次方程。
係課程入邊，我地仲會介紹用計數機程式解一元二次方程，要注意的時，這個計算機程式是會幫你計埋中間的步驟，不是計數機預設的程式，只有答案無步驟。例如︰它們將(2x ) 2 + 2 (2x)(5) +(5) 2 寫成=(2x + 5) 2 。
記住，好多時都會見到人標榜或買到什麼計算機程式一百個，但要入一百個程式你要帶25部計算機入試場，而我應對公開試只需3個就足夠有餘。
Solve 完二次方程後我地會講下判別式的用處，兩根的和及積以及複數。
懂得基本知識，當然要知點用，即係點考。例如考試唔會真係就咁比條二次方程(Quadratic Equation)比你去solve，而係以另一種形式出現，咁你就要知點做。
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Course Curriculum
基本知識
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StartQuadratic equation in one unknown - Factor Method 一元二次方程 因式法 (3:13)
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StartQuadratic equation in one unknown - Factor Method by Calculator 一元二次方程 因式法 (計算機版) (2:43)
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StartCompleting the square 配方法 (3:15)
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StartQuadratic formula 二次公式 (1:57)
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StartDiscriminant 判別式 (2:50)
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StartSum and product of roots兩根之和及兩根之積 (1:10)
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StartComplex number 複數 (4:39)
考法
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