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受欢迎的代数 >

x^2+2x+0.5=0

解答

x^{2} + 2 x + 0.5 = 0

解答

x = \frac{- 2 + 2}{2}, x = - \frac{2 + 1}{2}

+1

十进制

x = - 0.29289 \dots, x = - 1.70710 \dots

求解步骤

x^{2} + 2 x + 0.5 = 0

在两边乘以

10

10 x^{2} + 20 x + 5 = 0

使用求根公式求解

x_{1, 2} = \frac{- 20 \pm 2 0 ^{2} - 4 \cdot 10 \cdot 5}{2 \cdot 10}

2 0^{2} - 4 \cdot 10 \cdot 5 = 102

x_{1, 2} = \frac{- 20 \pm 10 2}{2 \cdot 10}

将解分隔开

x_{1} = \frac{- 20 + 10 2}{2 \cdot 10}, x_{2} = \frac{- 20 - 10 2}{2 \cdot 10}

x = \frac{- 20 + 10 2}{2 \cdot 10} : \frac{- 2 + 2}{2}

x = \frac{- 20 - 10 2}{2 \cdot 10} : - \frac{2 + 1}{2}

二次方程组的解是:

x = \frac{- 2 + 2}{2}, x = - \frac{2 + 1}{2}

作图

流行的例子

x^{2} - 21 x + 80 = 0

4 x^{2} - 7 = 9

-x^2-2x+58=3x+22

- x^{2} - 2 x + 58 = 3 x + 22

-t^2+70t+460=1516

- t^{2} + 70 t + 460 = 1516

10 x - x^{2} = 0