3m^2-9m-11=0

解答

3 m^{2} - 9 m - 11 = 0

m = \frac{9 + 213}{6}, m = \frac{9 - 213}{6}

十进制

m = 3.93241 \dots, m = - 0.93241 \dots

求解步骤

3 m^{2} - 9 m - 11 = 0

使用求根公式求解

m_{1, 2} = \frac{- ( - 9 ) \pm ( - 9 ) ^{2} - 4 \cdot 3 ( - 11 )}{2 \cdot 3}

(- 9)^{2} - 4 \cdot 3 (- 11) = 213

m_{1, 2} = \frac{- ( - 9 ) \pm 213}{2 \cdot 3}

将解分隔开

m_{1} = \frac{- ( - 9 ) + 213}{2 \cdot 3}, m_{2} = \frac{- ( - 9 ) - 213}{2 \cdot 3}

m = \frac{- ( - 9 ) + 213}{2 \cdot 3} : \frac{9 + 213}{6}

m = \frac{- ( - 9 ) - 213}{2 \cdot 3} : \frac{9 - 213}{6}

二次方程组的解是:

m = \frac{9 + 213}{6}, m = \frac{9 - 213}{6}

r^{2} = 2 (1 - r) r

x^{2} + (x + 5)^{2} + (x + 8)^{2} = 418

3 (x + 1) - x (x - 1) = 4 x

A (x) = x^{2} + π \frac{( 10 - x ) ^{2}}{4}

so l v e f or x, x^{2} y - y - x^{2} = 0