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 >

5n^2+9.8n-1200=0

解答

5 n^{2} + 9.8 n - 1200 = 0

解答

n = \frac{- 49 + 602401}{50}, n = - \frac{49 + 602401}{50}

+1

十进制

n = 14.54289 \dots, n = - 16.50289 \dots

求解步骤

5 n^{2} + 9.8 n - 1200 = 0

在两边乘以

10

50 n^{2} + 98 n - 12000 = 0

使用求根公式求解

n_{1, 2} = \frac{- 98 \pm 9 8 ^{2} - 4 \cdot 50 ( - 12000 )}{2 \cdot 50}

9 8^{2} - 4 \cdot 50 (- 12000) = 2602401

n_{1, 2} = \frac{- 98 \pm 2 602401}{2 \cdot 50}

将解分隔开

n_{1} = \frac{- 98 + 2 602401}{2 \cdot 50}, n_{2} = \frac{- 98 - 2 602401}{2 \cdot 50}

n = \frac{- 98 + 2 602401}{2 \cdot 50} : \frac{- 49 + 602401}{50}

n = \frac{- 98 - 2 602401}{2 \cdot 50} : - \frac{49 + 602401}{50}

二次方程组的解是:

n = \frac{- 49 + 602401}{50}, n = - \frac{49 + 602401}{50}

作图

流行的例子

x^{2} - 3 x - 26 = 2

solvefor x,y^3+3x^2y=c_{1}

so l v e f or x, y^{3} + 3 x^{2} y = c_{1}

8 x^{2} + 7 x - 1666 = 0

2 X^{2} + 8 X + 6 = 0

solvefor r,A=pi(r^2-r^2)

so l v e f or r, A = π (r^{2} - r^{2})