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受欢迎的代数 >

-2+x/(x+2)=-7/(x+2)

解答

- 2 + \frac{x}{x + 2} = - \frac{7}{x + 2}

解答

x = 3

求解步骤

- 2 + \frac{x}{x + 2} = - \frac{7}{x + 2}

在两边乘以

x + 2

- 2 (x + 2) + x = - 7

展开

- 2 (x + 2) + x : - x - 4

- x - 4 = - 7

将

4

到右边

- x = - 3

两边除以

- 1

x = 3

验证解

找到无定义的点（奇点）:

x = - 2

将不在定义域的点与解相综合:

x = 3

作图

流行的例子

6+x/(x+1)=-1/(x+1)

6 + \frac{x}{x + 1} = - \frac{1}{x + 1}

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x - \frac{3}{x - 7} = \frac{5}{x - 7}

x-2/(x-3)=(x-1)/(3-x)

x - \frac{2}{x - 3} = \frac{x - 1}{3 - x}

1/(1+x^2)= 1/2 x^2

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