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受欢迎的代数 >

x^2-2.5x+1.5=0

解答

x^{2} - 2.5 x + 1.5 = 0

解答

x = \frac{3}{2}, x = 1

+1

十进制

x = 1.5, x = 1

求解步骤

x^{2} - 2.5 x + 1.5 = 0

在两边乘以

10

10 x^{2} - 25 x + 15 = 0

使用求根公式求解

x_{1, 2} = \frac{- ( - 25 ) \pm ( - 25 ) ^{2} - 4 \cdot 10 \cdot 15}{2 \cdot 10}

(- 25)^{2} - 4 \cdot 10 \cdot 15 = 5

x_{1, 2} = \frac{- ( - 25 ) \pm 5}{2 \cdot 10}

将解分隔开

x_{1} = \frac{- ( - 25 ) + 5}{2 \cdot 10}, x_{2} = \frac{- ( - 25 ) - 5}{2 \cdot 10}

x = \frac{- ( - 25 ) + 5}{2 \cdot 10} : \frac{3}{2}

x = \frac{- ( - 25 ) - 5}{2 \cdot 10} : 1

二次方程组的解是:

x = \frac{3}{2}, x = 1

作图

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ax^2+bx+c=0,a=θ

a x^{2} + b x + c = 0, a = θ