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 >

21000=0.6822x(2.5)/(1.4)(54-0.4x)

解答

21000 = 0.68 \cdot 22 \cdot x \cdot \frac{2.5}{1.4} \cdot (54 - 0.4 x)

解答

x = \frac{1442.57142 \dots - 1183412.32653 \dots}{21.37142 \dots}, x = \frac{1442.57142 \dots + 1183412.32653 \dots}{21.37142 \dots}

+1

十进制

x = 16.59804 \dots, x = 118.40195 \dots

求解步骤

21000 = 0.68 \cdot 22 x \frac{2.5}{1.4} (54 - 0.4 x)

展开

0.68 \cdot 22 x \frac{2.5}{1.4} (54 - 0.4 x) : 1442.57142 \dots x - 10.68571 \dots x^{2}

21000 = 1442.57142 \dots x - 10.68571 \dots x^{2}

交换两边

1442.57142 \dots x - 10.68571 \dots x^{2} = 21000

将

21000

para o lado esquerdo

1442.57142 \dots x - 10.68571 \dots x^{2} - 21000 = 0

改写成标准形式

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

- 10.68571 \dots x^{2} + 1442.57142 \dots x - 21000 = 0

使用求根公式求解

x_{1, 2} = \frac{- 1442.57142 \dots \pm 1442.57142 \dots ^{2} - 4 ( - 10.68571 \dots ) ( - 21000 )}{2 ( - 10.68571 \dots )}

1442.57142 \dots^{2} - 4 (- 10.68571 \dots) (- 21000) = 1183412.32653 \dots

x_{1, 2} = \frac{- 1442.57142 \dots \pm 1183412.32653 \dots}{2 ( - 10.68571 \dots )}

将解分隔开

x_{1} = \frac{- 1442.57142 \dots + 1183412.32653 \dots}{2 ( - 10.68571 \dots )}, x_{2} = \frac{- 1442.57142 \dots - 1183412.32653 \dots}{2 ( - 10.68571 \dots )}

x = \frac{- 1442.57142 \dots + 1183412.32653 \dots}{2 ( - 10.68571 \dots )} : \frac{1442.57142 \dots - 1183412.32653 \dots}{21.37142 \dots}

x = \frac{- 1442.57142 \dots - 1183412.32653 \dots}{2 ( - 10.68571 \dots )} : \frac{1442.57142 \dots + 1183412.32653 \dots}{21.37142 \dots}

二次方程组的解是:

x = \frac{1442.57142 \dots - 1183412.32653 \dots}{21.37142 \dots}, x = \frac{1442.57142 \dots + 1183412.32653 \dots}{21.37142 \dots}

作图

流行的例子

\frac{y ^{2}}{2} - 3 = y + 1

quadraticformula (x^2-6)/2-(x^2+4)/4 =5

q u a d r a t i c f or m u l a \frac{x ^{2} - 6}{2} - \frac{x ^{2} + 4}{4} = 5

因式分解 5x^2=40x

f a c t or 5 x^{2} = 40 x

x=0.55*(6.71-x*0.75)^2

x = 0.55 \cdot (6.71 - x \cdot 0.75)^{2}

solvefor x,4x^2=0

so l v e f or x, 4 x^{2} = 0