From 33058f2b292b3a581333bdfb21b8f671898c5060 Mon Sep 17 00:00:00 2001 From: Peter Bengtsson Date: Tue, 8 Dec 2020 14:40:17 -0500 Subject: initial commit --- .../examples/deriving_the_quadratic_formula/index.html | 12 ++++++++++++ 1 file changed, 12 insertions(+) create mode 100644 files/zh-cn/web/mathml/examples/deriving_the_quadratic_formula/index.html (limited to 'files/zh-cn/web/mathml/examples/deriving_the_quadratic_formula') diff --git a/files/zh-cn/web/mathml/examples/deriving_the_quadratic_formula/index.html b/files/zh-cn/web/mathml/examples/deriving_the_quadratic_formula/index.html new file mode 100644 index 0000000000..8c6f3d97dc --- /dev/null +++ b/files/zh-cn/web/mathml/examples/deriving_the_quadratic_formula/index.html @@ -0,0 +1,12 @@ +--- +title: 'MathML: Deriving the Quadratic Formula' +slug: Web/MathML/Examples/Deriving_the_Quadratic_Formula +translation_of: Web/MathML/Examples/Deriving_the_Quadratic_Formula +--- +
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本页概述了二次方程式的推导过程。

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我们取一般形式的二次方程,并解出 x:

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a x 2 + b x + c = 0 a x 2 + b x = - c x 2 + b a x = -c a Divide out leading coefficient. x 2 + b a x + b 2 a 2 = - c ( 4 a ) a ( 4 a ) + b 2 4 a 2 Complete the square. ( x + b 2 a ) ( x + b 2 a ) = b 2 - 4 a c 4 a 2 Discriminant revealed. ( x + b 2 a ) 2 = b 2 - 4 a c 4 a 2 x + b 2 a = b 2 - 4 a c 4 a 2 x = -b 2 a ±{C} b 2 - 4 a c 4 a 2 There's the vertex formula. x = - b ±{C} b 2 - 4 a c 2 a

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