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受欢迎的代数 >

w^2-22w+121=81

解答

w^{2} - 22 w + 121 = 81

解答

w = 20, w = 2

求解步骤

w^{2} - 22 w + 121 = 81

将

81

para o lado esquerdo

w^{2} - 22 w + 40 = 0

使用求根公式求解

w_{1, 2} = \frac{- ( - 22 ) \pm ( - 22 ) ^{2} - 4 \cdot 1 \cdot 40}{2 \cdot 1}

(- 22)^{2} - 4 \cdot 1 \cdot 40 = 18

w_{1, 2} = \frac{- ( - 22 ) \pm 18}{2 \cdot 1}

将解分隔开

w_{1} = \frac{- ( - 22 ) + 18}{2 \cdot 1}, w_{2} = \frac{- ( - 22 ) - 18}{2 \cdot 1}

w = \frac{- ( - 22 ) + 18}{2 \cdot 1} : 20

w = \frac{- ( - 22 ) - 18}{2 \cdot 1} : 2

二次方程组的解是:

w = 20, w = 2

作图

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