0=(x^2+3x)/((3x+1)^2)

解答

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

x = 0, x = - 3

求解步骤

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

\frac{f ( x )}{g ( x )} = 0 \Rightarrow f (x) = 0

0 = x^{2} + 3 x

解

0 = x^{2} + 3 x : x = 0, x = - 3

x = 0, x = - 3

验证解

找到无定义的点（奇点）:

x = - \frac{1}{3}

将不在定义域的点与解相综合:

x = 0, x = - 3

so l v e f or r, F = G \frac{mm}{r ^{2}}

\frac{5}{x} = \frac{2}{x - 3}

\frac{2}{x - 7} = \frac{9}{x + 7}

\frac{x - 2}{3 x + 4} = - 3

\frac{3 x}{x - 4} = 3 + \frac{2}{x}