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受欢迎的代数 >

5d^2+5d-3=2d^2

解答

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

解答

d = \frac{- 5 + 61}{6}, d = \frac{- 5 - 61}{6}

+1

十进制

d = 0.46837 \dots, d = - 2.13504 \dots

求解步骤

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

将

2 d^{2}

para o lado esquerdo

3 d^{2} + 5 d - 3 = 0

使用求根公式求解

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

5^{2} - 4 \cdot 3 (- 3) = 61

d_{1, 2} = \frac{- 5 \pm 61}{2 \cdot 3}

将解分隔开

d_{1} = \frac{- 5 + 61}{2 \cdot 3}, d_{2} = \frac{- 5 - 61}{2 \cdot 3}

d = \frac{- 5 + 61}{2 \cdot 3} : \frac{- 5 + 61}{6}

d = \frac{- 5 - 61}{2 \cdot 3} : \frac{- 5 - 61}{6}

二次方程组的解是:

d = \frac{- 5 + 61}{6}, d = \frac{- 5 - 61}{6}

作图

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