Question

Помогите плиз решить

Answer 1

Ответ:

а)

$\frac{15x {}^{4} - 25x {}^{3} }{5x {}^{5} } = \\ = \frac{5x {}^{3}(3x - 5) }{5x {}^{5} } = \\ = \frac{3x - 5}{x {}^{2} }$

б)

$\frac{9y {}^{2} - 1}{9y - 3} = \\ = \frac{(3y - 1)(3y + 1)}{3(3 - 1)} = \\ = \frac{3y + 1}{3}$

в)

$\frac{a {}^{2} + 4a + 4}{4 - a {}^{2} } = \\ = \frac{(a + 2) {}^{2} }{(2 - a)(2 + a)} = \\ = \frac{a + 2}{2 - a)}$