zs

English

Español

Português

Français

Deutsch

Italiano

Русский

中文(简体)

한국어

日本語

Tiếng Việt

עברית

العربية

受欢迎的代数 >

1-1.9z+0.9z^2=0

解答

1 - 1.9 z + 0.9 z^{2} = 0

解答

z = \frac{10}{9}, z = 1

+1

十进制

z = 1.11111 \dots, z = 1

求解步骤

1 - 1.9 z + 0.9 z^{2} = 0

在两边乘以

10

10 - 19 z + 9 z^{2} = 0

改写成标准形式

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

9 z^{2} - 19 z + 10 = 0

使用求根公式求解

z_{1, 2} = \frac{- ( - 19 ) \pm ( - 19 ) ^{2} - 4 \cdot 9 \cdot 10}{2 \cdot 9}

(- 19)^{2} - 4 \cdot 9 \cdot 10 = 1

z_{1, 2} = \frac{- ( - 19 ) \pm 1}{2 \cdot 9}

将解分隔开

z_{1} = \frac{- ( - 19 ) + 1}{2 \cdot 9}, z_{2} = \frac{- ( - 19 ) - 1}{2 \cdot 9}

z = \frac{- ( - 19 ) + 1}{2 \cdot 9} : \frac{10}{9}

z = \frac{- ( - 19 ) - 1}{2 \cdot 9} : 1

二次方程组的解是:

z = \frac{10}{9}, z = 1

作图

流行的例子

2 x^{2} + 3 x - 15 = 0

因式分解 3x^2-5x-2=0

f a c t or 3 x^{2} - 5 x - 2 = 0

- x^{2} = - 12 x + 6

3 r^{2} + 2 r + 1 = 0

solvefor r,V=pir^2 h/3

so l v e f or r, V = π r^{2} \frac{h}{3}