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受欢迎的代数 >

3x^2-20x+28=0

解答

3 x^{2} - 20 x + 28 = 0

解答

x = \frac{14}{3}, x = 2

+1

十进制

x = 4.66666 \dots, x = 2

求解步骤

3 x^{2} - 20 x + 28 = 0

使用求根公式求解

x_{1, 2} = \frac{- ( - 20 ) \pm ( - 20 ) ^{2} - 4 \cdot 3 \cdot 28}{2 \cdot 3}

(- 20)^{2} - 4 \cdot 3 \cdot 28 = 8

x_{1, 2} = \frac{- ( - 20 ) \pm 8}{2 \cdot 3}

将解分隔开

x_{1} = \frac{- ( - 20 ) + 8}{2 \cdot 3}, x_{2} = \frac{- ( - 20 ) - 8}{2 \cdot 3}

x = \frac{- ( - 20 ) + 8}{2 \cdot 3} : \frac{14}{3}

x = \frac{- ( - 20 ) - 8}{2 \cdot 3} : 2

二次方程组的解是:

x = \frac{14}{3}, x = 2

作图

流行的例子

12 z^{2} - 15 z + 4 = 0

0 = - x^{2} + 10 x - 16

18 a^{2} - 30 = - 33 a

- 2 x^{2} + 12 x - 5 = 0

x^2-3/2 x= 7/16

x^{2} - \frac{3}{2} x = \frac{7}{16}