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受欢迎的代数 >

8=-3n^2+10n

解答

8 = - 3 n^{2} + 10 n

解答

n = \frac{4}{3}, n = 2

+1

十进制

n = 1.33333 \dots, n = 2

求解步骤

8 = - 3 n^{2} + 10 n

交换两边

- 3 n^{2} + 10 n = 8

将

8

para o lado esquerdo

- 3 n^{2} + 10 n - 8 = 0

使用求根公式求解

n_{1, 2} = \frac{- 10 \pm 1 0 ^{2} - 4 ( - 3 ) ( - 8 )}{2 ( - 3 )}

1 0^{2} - 4 (- 3) (- 8) = 2

n_{1, 2} = \frac{- 10 \pm 2}{2 ( - 3 )}

将解分隔开

n_{1} = \frac{- 10 + 2}{2 ( - 3 )}, n_{2} = \frac{- 10 - 2}{2 ( - 3 )}

n = \frac{- 10 + 2}{2 ( - 3 )} : \frac{4}{3}

n = \frac{- 10 - 2}{2 ( - 3 )} : 2

二次方程组的解是:

n = \frac{4}{3}, n = 2

作图

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