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受欢迎的代数 >

x^2-2.4x=2.2

解答

x^{2} - 2.4 x = 2.2

解答

x = \frac{6 + 91}{5}, x = \frac{6 - 91}{5}

+1

十进制

x = 3.10787 \dots, x = - 0.70787 \dots

求解步骤

x^{2} - 2.4 x = 2.2

在两边乘以

10

10 x^{2} - 24 x = 22

将

22

para o lado esquerdo

10 x^{2} - 24 x - 22 = 0

使用求根公式求解

x_{1, 2} = \frac{- ( - 24 ) \pm ( - 24 ) ^{2} - 4 \cdot 10 ( - 22 )}{2 \cdot 10}

(- 24)^{2} - 4 \cdot 10 (- 22) = 491

x_{1, 2} = \frac{- ( - 24 ) \pm 4 91}{2 \cdot 10}

将解分隔开

x_{1} = \frac{- ( - 24 ) + 4 91}{2 \cdot 10}, x_{2} = \frac{- ( - 24 ) - 4 91}{2 \cdot 10}

x = \frac{- ( - 24 ) + 4 91}{2 \cdot 10} : \frac{6 + 91}{5}

x = \frac{- ( - 24 ) - 4 91}{2 \cdot 10} : \frac{6 - 91}{5}

二次方程组的解是:

x = \frac{6 + 91}{5}, x = \frac{6 - 91}{5}

作图

流行的例子

t^{2} - 6 = 0

3 x^{2} - 21 x + 18 = 0

z^{2} - 32 = 0

x^{2} - 15 x - 54 = 0

r^{2} + 12 r + 4 = 7