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受欢迎的代数 >

4d^2-5d-5=3d

解答

4 d^{2} - 5 d - 5 = 3 d

解答

d = \frac{5}{2}, d = - \frac{1}{2}

+1

十进制

d = 2.5, d = - 0.5

求解步骤

4 d^{2} - 5 d - 5 = 3 d

将

3 d

para o lado esquerdo

4 d^{2} - 8 d - 5 = 0

使用求根公式求解

d_{1, 2} = \frac{- ( - 8 ) \pm ( - 8 ) ^{2} - 4 \cdot 4 ( - 5 )}{2 \cdot 4}

(- 8)^{2} - 4 \cdot 4 (- 5) = 12

d_{1, 2} = \frac{- ( - 8 ) \pm 12}{2 \cdot 4}

将解分隔开

d_{1} = \frac{- ( - 8 ) + 12}{2 \cdot 4}, d_{2} = \frac{- ( - 8 ) - 12}{2 \cdot 4}

d = \frac{- ( - 8 ) + 12}{2 \cdot 4} : \frac{5}{2}

d = \frac{- ( - 8 ) - 12}{2 \cdot 4} : - \frac{1}{2}

二次方程组的解是:

d = \frac{5}{2}, d = - \frac{1}{2}

作图

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