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受欢迎的代数 >

((5x))/((x-3))+4/((x+3))=(90)/((x^2-9))

解答

\frac{( 5 x )}{( x - 3 )} + \frac{4}{( x + 3 )} = \frac{90}{( x ^{2} - 9 )}

解答

x = - \frac{34}{5}

+1

十进制

x = - 6.8

求解步骤

\frac{( 5 x )}{( x - 3 )} + \frac{4}{( x + 3 )} = \frac{90}{( x ^{2} - 9 )}

乘以最小公倍数

5 x (x + 3) + 4 (x - 3) = 90

解

5 x (x + 3) + 4 (x - 3) = 90 : x = 3, x = - \frac{34}{5}

x = 3, x = - \frac{34}{5}

验证解

找到无定义的点（奇点）:

x = - 3, x = 3

因为方程对以下值无定义:

3

x = - \frac{34}{5}

作图

流行的例子

∣ x ∣ = \frac{1}{x}

solvefor s,1+(k_{c})/(((2s+1)(5s+1)))=0

so l v e f or s, 1 + \frac{k _{c}}{( ( 2 s + 1 ) ( 5 s + 1 ) )} = 0

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

\frac{x}{( 3 - 2 x )} = \frac{( x + 1 )}{( 3 - x )}

ln(10/9)=(36*10^{10})/x

ln (\frac{10}{9}) = \frac{36 \cdot 1 0 ^{10}}{x}

2((x+1)/x)^2-7((x+1)/x)+5=0

2 (\frac{x + 1}{x})^{2} - 7 (\frac{x + 1}{x}) + 5 = 0