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受欢迎的代数 >

s^2-5s+4=0

解答

s^{2} - 5 s + 4 = 0

解答

s = 4, s = 1

求解步骤

s^{2} - 5 s + 4 = 0

使用求根公式求解

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

(- 5)^{2} - 4 \cdot 1 \cdot 4 = 3

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

将解分隔开

s_{1} = \frac{- ( - 5 ) + 3}{2 \cdot 1}, s_{2} = \frac{- ( - 5 ) - 3}{2 \cdot 1}

s = \frac{- ( - 5 ) + 3}{2 \cdot 1} : 4

s = \frac{- ( - 5 ) - 3}{2 \cdot 1} : 1

二次方程组的解是:

s = 4, s = 1

作图

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