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人気のある代数 >

1-1.9x-0.1x^2=0

解

1 - 1.9 x - 0.1 x^{2} = 0

解

x = - \frac{19 + 401}{2}, x = \frac{401 - 19}{2}

+1

十進法表記

x = - 19.51249 \dots, x = 0.51249 \dots

解答ステップ

1 - 1.9 x - 0.1 x^{2} = 0

以下で両辺を乗じる:

10

10 - 19 x - x^{2} = 0

標準的な形式で書く

a x^{2} + b x + c = 0

- x^{2} - 19 x + 10 = 0

解くとthe二次式

x_{1, 2} = \frac{- ( - 19 ) \pm ( - 19 ) ^{2} - 4 ( - 1 ) \cdot 10}{2 ( - 1 )}

(- 19)^{2} - 4 (- 1) \cdot 10 = 401

x_{1, 2} = \frac{- ( - 19 ) \pm 401}{2 ( - 1 )}

解を分離する

x_{1} = \frac{- ( - 19 ) + 401}{2 ( - 1 )}, x_{2} = \frac{- ( - 19 ) - 401}{2 ( - 1 )}

x = \frac{- ( - 19 ) + 401}{2 ( - 1 )} : - \frac{19 + 401}{2}

x = \frac{- ( - 19 ) - 401}{2 ( - 1 )} : \frac{401 - 19}{2}

二次equationの解:

x = - \frac{19 + 401}{2}, x = \frac{401 - 19}{2}

グラフ

人気の例

solvefor u,E= 1/2 mv^2-1/2 mu^2

so l v e f or u, E = \frac{1}{2} m v^{2} - \frac{1}{2} m u^{2}

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co m pl e t es q u a re x^{2} - 6 x + 12