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受欢迎的代数 >

m^2-9m+9=0

解答

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

解答

m = \frac{9 + 3 5}{2}, m = \frac{9 - 3 5}{2}

+1

十进制

m = 7.85410 \dots, m = 1.14589 \dots

求解步骤

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

使用求根公式求解

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

(- 9)^{2} - 4 \cdot 1 \cdot 9 = 35

m_{1, 2} = \frac{- ( - 9 ) \pm 3 5}{2 \cdot 1}

将解分隔开

m_{1} = \frac{- ( - 9 ) + 3 5}{2 \cdot 1}, m_{2} = \frac{- ( - 9 ) - 3 5}{2 \cdot 1}

m = \frac{- ( - 9 ) + 3 5}{2 \cdot 1} : \frac{9 + 3 5}{2}

m = \frac{- ( - 9 ) - 3 5}{2 \cdot 1} : \frac{9 - 3 5}{2}

二次方程组的解是:

m = \frac{9 + 3 5}{2}, m = \frac{9 - 3 5}{2}

作图

流行的例子

7 u^{2} + 2 u - 15 = 0

completesquare 3x^2-6x+17

co m pl e t es q u a re 3 x^{2} - 6 x + 17

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

48-(10-3+x^2)+2xx=4

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