zs

English

Español

Português

Français

Deutsch

Italiano

Русский

中文(简体)

한국어

日本語

Tiếng Việt

עברית

العربية

受欢迎的代数 >

10x^2-21x+2=0

解答

10 x^{2} - 21 x + 2 = 0

解答

x = 2, x = \frac{1}{10}

+1

十进制

x = 2, x = 0.1

求解步骤

10 x^{2} - 21 x + 2 = 0

使用求根公式求解

x_{1, 2} = \frac{- ( - 21 ) \pm ( - 21 ) ^{2} - 4 \cdot 10 \cdot 2}{2 \cdot 10}

(- 21)^{2} - 4 \cdot 10 \cdot 2 = 19

x_{1, 2} = \frac{- ( - 21 ) \pm 19}{2 \cdot 10}

将解分隔开

x_{1} = \frac{- ( - 21 ) + 19}{2 \cdot 10}, x_{2} = \frac{- ( - 21 ) - 19}{2 \cdot 10}

x = \frac{- ( - 21 ) + 19}{2 \cdot 10} : 2

x = \frac{- ( - 21 ) - 19}{2 \cdot 10} : \frac{1}{10}

二次方程组的解是:

x = 2, x = \frac{1}{10}

作图

流行的例子

- 5 x^{2} - 8 x = 15

因式分解 (2^{2x}-2^x)/(2^x-1)

f a c t or \frac{2 ^{2 x} - 2 ^{x}}{2 ^{x} - 1}

化简 \sqrt[3]{63}

s im pl i f y 363

- 1 = \frac{- b}{1}

5(2m+6)=4(5+2m)+3m

5 (2 m + 6) = 4 (5 + 2 m) + 3 m