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受欢迎的代数 >

x^2-1.7x+0.72=0

解答

x^{2} - 1.7 x + 0.72 = 0

解答

x = \frac{9}{10}, x = \frac{4}{5}

+1

十进制

x = 0.9, x = 0.8

求解步骤

x^{2} - 1.7 x + 0.72 = 0

在两边乘以

100

100 x^{2} - 170 x + 72 = 0

使用求根公式求解

x_{1, 2} = \frac{- ( - 170 ) \pm ( - 170 ) ^{2} - 4 \cdot 100 \cdot 72}{2 \cdot 100}

(- 170)^{2} - 4 \cdot 100 \cdot 72 = 10

x_{1, 2} = \frac{- ( - 170 ) \pm 10}{2 \cdot 100}

将解分隔开

x_{1} = \frac{- ( - 170 ) + 10}{2 \cdot 100}, x_{2} = \frac{- ( - 170 ) - 10}{2 \cdot 100}

x = \frac{- ( - 170 ) + 10}{2 \cdot 100} : \frac{9}{10}

x = \frac{- ( - 170 ) - 10}{2 \cdot 100} : \frac{4}{5}

二次方程组的解是:

x = \frac{9}{10}, x = \frac{4}{5}

作图

流行的例子

25 x^{2} - 15 x + 2 = 0

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

5 - 2 x = 3 x

化简 (4-4i)^3

s im pl i f y (4 - 4 i)^{3}

化简 (8x^5y^4)/(4x^2y^2)

s im pl i f y \frac{8 x ^{5} y ^{4}}{4 x ^{2} y ^{2}}