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受欢迎的代数 >

2s^2-5s=3

解答

2 s^{2} - 5 s = 3

解答

s = 3, s = - \frac{1}{2}

+1

十进制

s = 3, s = - 0.5

求解步骤

2 s^{2} - 5 s = 3

将

3

para o lado esquerdo

2 s^{2} - 5 s - 3 = 0

使用求根公式求解

s_{1, 2} = \frac{- ( - 5 ) \pm ( - 5 ) ^{2} - 4 \cdot 2 ( - 3 )}{2 \cdot 2}

(- 5)^{2} - 4 \cdot 2 (- 3) = 7

s_{1, 2} = \frac{- ( - 5 ) \pm 7}{2 \cdot 2}

将解分隔开

s_{1} = \frac{- ( - 5 ) + 7}{2 \cdot 2}, s_{2} = \frac{- ( - 5 ) - 7}{2 \cdot 2}

s = \frac{- ( - 5 ) + 7}{2 \cdot 2} : 3

s = \frac{- ( - 5 ) - 7}{2 \cdot 2} : - \frac{1}{2}

二次方程组的解是:

s = 3, s = - \frac{1}{2}

作图

流行的例子

3 x^{2} + 3 x = 2 x - 1

(λ^2-14)-20=λ

(λ^{2} - 14) - 20 = λ

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so l v e f or x, x^{2} - 2 x = m^{2} + 2 m

-3x^2+(7k^2-3)x+7=0

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