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受欢迎的代数 >

18x-6=9x^2

解答

18 x - 6 = 9 x^{2}

解答

x = \frac{3 + 3}{3}, x = \frac{3 - 3}{3}

+1

十进制

x = 1.57735 \dots, x = 0.42264 \dots

求解步骤

18 x - 6 = 9 x^{2}

交换两边

9 x^{2} = 18 x - 6

将

6

para o lado esquerdo

9 x^{2} + 6 = 18 x

将

18 x

para o lado esquerdo

9 x^{2} + 6 - 18 x = 0

改写成标准形式

a x^{2} + b x + c = 0

9 x^{2} - 18 x + 6 = 0

使用求根公式求解

x_{1, 2} = \frac{- ( - 18 ) \pm ( - 18 ) ^{2} - 4 \cdot 9 \cdot 6}{2 \cdot 9}

(- 18)^{2} - 4 \cdot 9 \cdot 6 = 63

x_{1, 2} = \frac{- ( - 18 ) \pm 6 3}{2 \cdot 9}

将解分隔开

x_{1} = \frac{- ( - 18 ) + 6 3}{2 \cdot 9}, x_{2} = \frac{- ( - 18 ) - 6 3}{2 \cdot 9}

x = \frac{- ( - 18 ) + 6 3}{2 \cdot 9} : \frac{3 + 3}{3}

x = \frac{- ( - 18 ) - 6 3}{2 \cdot 9} : \frac{3 - 3}{3}

二次方程组的解是:

x = \frac{3 + 3}{3}, x = \frac{3 - 3}{3}

作图

流行的例子

solvefor y,x^2y^2+xy=12

so l v e f or y, x^{2} y^{2} + x y = 12

因式分解 x^2-5x-12=-5x+4

f a c t or x^{2} - 5 x - 12 = - 5 x + 4

z^{2} + 8 z + 15 = 0

11y^2-12y+4=6y^2

11 y^{2} - 12 y + 4 = 6 y^{2}

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