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受欢迎的代数 >

(x^2-x)/(x+2)=(2x-4)/(x-2)

解答

\frac{x ^{2} - x}{x + 2} = \frac{2 x - 4}{x - 2}

解答

x = 4, x = - 1

求解步骤

\frac{x ^{2} - x}{x + 2} = \frac{2 x - 4}{x - 2}

化简

\frac{2 x - 4}{x - 2} : 2

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

在两边乘以

x + 2

x^{2} - x = 2 (x + 2)

解

x^{2} - x = 2 (x + 2) : x = 4, x = - 1

x = 4, x = - 1

验证解

找到无定义的点（奇点）:

x = - 2, x = 2

将不在定义域的点与解相综合:

x = 4, x = - 1

作图

流行的例子

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