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受欢迎的代数 >

4/(5a-8)=a+2

解答

\frac{4}{5 a - 8} = a + 2

解答

a = \frac{- 1 + 101}{5}, a = - \frac{1 + 101}{5}

+1

十进制

a = 1.80997 \dots, a = - 2.20997 \dots

求解步骤

\frac{4}{5 a - 8} = a + 2

在两边乘以

5 a - 8

4 = a (5 a - 8) + 2 (5 a - 8)

解

4 = a (5 a - 8) + 2 (5 a - 8) : a = \frac{- 1 + 101}{5}, a = - \frac{1 + 101}{5}

a = \frac{- 1 + 101}{5}, a = - \frac{1 + 101}{5}

验证解

找到无定义的点（奇点）:

a = \frac{8}{5}

将不在定义域的点与解相综合:

a = \frac{- 1 + 101}{5}, a = - \frac{1 + 101}{5}

作图

流行的例子

\frac{11}{x} - 2 = \frac{3}{x}

-5=(5-2x)/(x^2-1)

- 5 = \frac{5 - 2 x}{x ^{2} - 1}

\frac{1}{2} = \frac{4}{x}

-(4x)/((x^2-1)^2)=0

- \frac{4 x}{( x ^{2} - 1 ) ^{2}} = 0

\frac{12}{15} = \frac{26}{x}