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受欢迎的代数 >

10m^2-2m=7

解答

10 m^{2} - 2 m = 7

解答

m = \frac{1 + 71}{10}, m = \frac{1 - 71}{10}

+1

十进制

m = 0.94261 \dots, m = - 0.74261 \dots

求解步骤

10 m^{2} - 2 m = 7

将

7

para o lado esquerdo

10 m^{2} - 2 m - 7 = 0

使用求根公式求解

m_{1, 2} = \frac{- ( - 2 ) \pm ( - 2 ) ^{2} - 4 \cdot 10 ( - 7 )}{2 \cdot 10}

(- 2)^{2} - 4 \cdot 10 (- 7) = 271

m_{1, 2} = \frac{- ( - 2 ) \pm 2 71}{2 \cdot 10}

将解分隔开

m_{1} = \frac{- ( - 2 ) + 2 71}{2 \cdot 10}, m_{2} = \frac{- ( - 2 ) - 2 71}{2 \cdot 10}

m = \frac{- ( - 2 ) + 2 71}{2 \cdot 10} : \frac{1 + 71}{10}

m = \frac{- ( - 2 ) - 2 71}{2 \cdot 10} : \frac{1 - 71}{10}

二次方程组的解是:

m = \frac{1 + 71}{10}, m = \frac{1 - 71}{10}

作图

流行的例子

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