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人気のある代数 >

0.8x^2-8.16x+4.8=0

解

0.8 x^{2} - 8.16 x + 4.8 = 0

解

x = \frac{51 + 2001}{10}, x = \frac{51 - 2001}{10}

+1

十進法表記

x = 9.57325 \dots, x = 0.62674 \dots

解答ステップ

0.8 x^{2} - 8.16 x + 4.8 = 0

以下で両辺を乗じる:

100

80 x^{2} - 816 x + 480 = 0

解くとthe二次式

x_{1, 2} = \frac{- ( - 816 ) \pm ( - 816 ) ^{2} - 4 \cdot 80 \cdot 480}{2 \cdot 80}

(- 816)^{2} - 4 \cdot 80 \cdot 480 = 162001

x_{1, 2} = \frac{- ( - 816 ) \pm 16 2001}{2 \cdot 80}

解を分離する

x_{1} = \frac{- ( - 816 ) + 16 2001}{2 \cdot 80}, x_{2} = \frac{- ( - 816 ) - 16 2001}{2 \cdot 80}

x = \frac{- ( - 816 ) + 16 2001}{2 \cdot 80} : \frac{51 + 2001}{10}

x = \frac{- ( - 816 ) - 16 2001}{2 \cdot 80} : \frac{51 - 2001}{10}

二次equationの解:

x = \frac{51 + 2001}{10}, x = \frac{51 - 2001}{10}

グラフ

人気の例

8 x^{2} - 2 x - 21 = 0

solvefor a,a^5+b^5=(a+b)(a^4-a^3b+a^2b^2-ab^3+b^4)

so l v e f or a, a^{5} + b^{5} = (a + b) (a^{4} - a^{3} b + a^{2} b^{2} - a b^{3} + b^{4})

solvefor q, 1/4 q^2+r=p

so l v e f or q, \frac{1}{4} q^{2} + r = p

a^{2} + 1 3^{2} = 1 2^{2}

completesquare 6x^2+5x

co m pl e t es q u a re 6 x^{2} + 5 x