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受欢迎的代数 >

m^2=-15+9m

解答

m^{2} = - 15 + 9 m

解答

m = \frac{9 + 21}{2}, m = \frac{9 - 21}{2}

+1

十进制

m = 6.79128 \dots, m = 2.20871 \dots

求解步骤

m^{2} = - 15 + 9 m

将

9 m

para o lado esquerdo

m^{2} - 9 m = - 15

将

15

para o lado esquerdo

m^{2} - 9 m + 15 = 0

使用求根公式求解

m_{1, 2} = \frac{- ( - 9 ) \pm ( - 9 ) ^{2} - 4 \cdot 1 \cdot 15}{2 \cdot 1}

(- 9)^{2} - 4 \cdot 1 \cdot 15 = 21

m_{1, 2} = \frac{- ( - 9 ) \pm 21}{2 \cdot 1}

将解分隔开

m_{1} = \frac{- ( - 9 ) + 21}{2 \cdot 1}, m_{2} = \frac{- ( - 9 ) - 21}{2 \cdot 1}

m = \frac{- ( - 9 ) + 21}{2 \cdot 1} : \frac{9 + 21}{2}

m = \frac{- ( - 9 ) - 21}{2 \cdot 1} : \frac{9 - 21}{2}

二次方程组的解是:

m = \frac{9 + 21}{2}, m = \frac{9 - 21}{2}

作图

流行的例子

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