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受欢迎的代数 >

x(10x-1)=2

解答

x (10 x - 1) = 2

解答

x = \frac{1}{2}, x = - \frac{2}{5}

+1

十进制

x = 0.5, x = - 0.4

求解步骤

x (10 x - 1) = 2

展开

x (10 x - 1) : 10 x^{2} - x

10 x^{2} - x = 2

将

2

para o lado esquerdo

10 x^{2} - x - 2 = 0

使用求根公式求解

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

(- 1)^{2} - 4 \cdot 10 (- 2) = 9

x_{1, 2} = \frac{- ( - 1 ) \pm 9}{2 \cdot 10}

将解分隔开

x_{1} = \frac{- ( - 1 ) + 9}{2 \cdot 10}, x_{2} = \frac{- ( - 1 ) - 9}{2 \cdot 10}

x = \frac{- ( - 1 ) + 9}{2 \cdot 10} : \frac{1}{2}

x = \frac{- ( - 1 ) - 9}{2 \cdot 10} : - \frac{2}{5}

二次方程组的解是:

x = \frac{1}{2}, x = - \frac{2}{5}

作图

流行的例子

x^{2} - 12 x = - 24

x^{2} - 12 x = - 10

4 x^{2} - 7 x - 1 = 0

2x^2-27x+12=-10x-19

2 x^{2} - 27 x + 12 = - 10 x - 19

solvefor x,x^2+y^2+8x-6y+30=0

so l v e f or x, x^{2} + y^{2} + 8 x - 6 y + 30 = 0