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受欢迎的代数 >

-0.4x^2+11x+12=-2.7x+96

解答

- 0.4 x^{2} + 11 x + 12 = - 2.7 x + 96

解答

x = 8, x = \frac{105}{4}

+1

十进制

x = 8, x = 26.25

求解步骤

- 0.4 x^{2} + 11 x + 12 = - 2.7 x + 96

在两边乘以

10

- 4 x^{2} + 110 x + 120 = - 27 x + 960

将

960

para o lado esquerdo

- 4 x^{2} + 110 x - 840 = - 27 x

将

27 x

para o lado esquerdo

- 4 x^{2} + 137 x - 840 = 0

使用求根公式求解

x_{1, 2} = \frac{- 137 \pm 13 7 ^{2} - 4 ( - 4 ) ( - 840 )}{2 ( - 4 )}

13 7^{2} - 4 (- 4) (- 840) = 73

x_{1, 2} = \frac{- 137 \pm 73}{2 ( - 4 )}

将解分隔开

x_{1} = \frac{- 137 + 73}{2 ( - 4 )}, x_{2} = \frac{- 137 - 73}{2 ( - 4 )}

x = \frac{- 137 + 73}{2 ( - 4 )} : 8

x = \frac{- 137 - 73}{2 ( - 4 )} : \frac{105}{4}

二次方程组的解是:

x = 8, x = \frac{105}{4}

作图

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