Tìm x biết
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n/ \( \frac{6 - x}{x^2 + 3x} + \frac{3}{2x + 6} \)
p/ \( \frac{3}{2y + 4} + \frac{1}{3y + 6} \)
o/ \( \frac{1}{xy - x^2} \quad \frac{1}{y^2 - xy} \)
t/ \( \frac{x + 1}{x + 4} - \frac{x^2 - 4}{x^2 - 16} \)
v/ \( \frac{-3x}{2x} + \frac{3x - 2}{2x - 4x^2} \)
w/ \( \frac{2x - 2}{15} + \frac{3 + 2y}{6x^3y} + \frac{2x - 5}{6x^3y} \)
y/ \( \frac{x^2}{x + y} + \frac{y^2}{x + y + z} - \frac{-y^2}{x + y} - \frac{-z^2}{y + z} \)
J/ \( A = \frac{20x^2 + 120x + 180}{(3x + 5)^2 - 4x^2} + \frac{5x^2 - 125}{9x^2 - (2x + 5)^2} \)
z/ \( \frac{1}{3x - 2} - \frac{4}{3x + 2} + \frac{3x - 6}{4 - 9x^2} \)
n/ \( \frac{6 - x}{x^2 + 3x} + \frac{3}{2x + 6} \)
p/ \( \frac{3}{2y + 4} + \frac{1}{3y + 6} \)
o/ \( \frac{1}{xy - x^2} \quad \frac{1}{y^2 - xy} \)
t/ \( \frac{x + 1}{x + 4} - \frac{x^2 - 4}{x^2 - 16} \)
v/ \( \frac{-3x}{2x} + \frac{3x - 2}{2x - 4x^2} \)
w/ \( \frac{2x - 2}{15} + \frac{3 + 2y}{6x^3y} + \frac{2x - 5}{6x^3y} \)
y/ \( \frac{x^2}{x + y} + \frac{y^2}{x + y + z} - \frac{-y^2}{x + y} - \frac{-z^2}{y + z} \)
J/ \( A = \frac{20x^2 + 120x + 180}{(3x + 5)^2 - 4x^2} + \frac{5x^2 - 125}{9x^2 - (2x + 5)^2} \)
z/ \( \frac{1}{3x - 2} - \frac{4}{3x + 2} + \frac{3x - 6}{4 - 9x^2} \)