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受欢迎的代数 >

10x^2-9x-9=0

解答

10 x^{2} - 9 x - 9 = 0

解答

x = \frac{3}{2}, x = - \frac{3}{5}

+1

十进制

x = 1.5, x = - 0.6

求解步骤

10 x^{2} - 9 x - 9 = 0

使用求根公式求解

x_{1, 2} = \frac{- ( - 9 ) \pm ( - 9 ) ^{2} - 4 \cdot 10 ( - 9 )}{2 \cdot 10}

(- 9)^{2} - 4 \cdot 10 (- 9) = 21

x_{1, 2} = \frac{- ( - 9 ) \pm 21}{2 \cdot 10}

将解分隔开

x_{1} = \frac{- ( - 9 ) + 21}{2 \cdot 10}, x_{2} = \frac{- ( - 9 ) - 21}{2 \cdot 10}

x = \frac{- ( - 9 ) + 21}{2 \cdot 10} : \frac{3}{2}

x = \frac{- ( - 9 ) - 21}{2 \cdot 10} : - \frac{3}{5}

二次方程组的解是:

x = \frac{3}{2}, x = - \frac{3}{5}

作图

流行的例子

x^{2} - 5 x - 24 = 0

4(8-2x)+2x<5(9+3x)

4 (8 - 2 x) + 2 x < 5 (9 + 3 x)

4(2y+5)<3(5y-2)

4 (2 y + 5) < 3 (5 y - 2)

3 x = 0. 5^{2}

5 x^{2} + 8 x = - 4