Решите пожалуйста: (x+3/x^2-3x+12/9-x^2)*3x/x-3. Created by juliarosenberg0. matematika-ru

Решение во вложении.

x-3...

mishka19
$( \frac{x + 3}{ {x}^{2} - 3x } + \frac{12}{9 - {x}^{2} } )\cdot \frac{3x}{x-3} = \frac{3}{x + 3} \\$
$1) \: \frac{x + 3}{ {x}^{2} - 3x} + \frac{12}{9 - {x}^{2} } = \frac{x + 3}{x(x - 3)} - \frac{12}{ {x}^{2} - 9} = \\ = \frac{x + 3}{x(x - 3)} - \frac{12}{ {x}^{2} - {3}^{2} } = \frac{x + 3}{x(x - 3)} - \frac{12}{(x - 3)(x + 3)} = \\ = \frac{(x + 3)^2-12x}{x(x - 3)(x + 3)} = \frac{ {x}^{2} + 2\cdot x\cdot3 + 3^{2} - 12x}{x(x - 3)(x + 3)} =$
$= \frac{ {x}^{2} + 6x + {3}^{2} - 12x }{x(x - 3)(x + 3)} = \frac{ {x}^{2} - 6x + {3}^{2} }{x(x - 3)(x + 3)} = \\ = \frac{ {x}^{2} - 2\cdot x\cdot3 + 3^{2}}{x(x - 3)(x + 3)} = \frac{ {(x - 3)}^{2} }{x(x - 3)(x + 3)} = \frac{ x - 3}{x(x + 3)}$
$2) \: \frac{ x - 3}{x(x + 3)} \cdot \frac{3x}{x - 3} = \frac{3}{x + 3} \\$
Ответ:
$\frac{3}{x +3} \\$

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