Question

решите пожалуйста,даю 25 баллов

Answer 1

$1)x = 0 \: \: \: \: x - 3 = 0 \\ x = 3$
2)x не равен 0 и -5
$3) \frac{5 - 3x + 2x}{25 - {x}^{2} } = \frac{5 - x}{(5 - x)(5 + x)} = \frac{1}{5 + x} = \frac{1}{6.5} = \frac{2}{13}$
$4) \frac{3y(2x + 1) + 2x(2 - 3y)}{36 {x}^{2} {y}^{2} } = \frac{6xy + 3y + 4x - 6xy}{36 {x}^{2} {y}^{2} } = \frac{3y + 4x}{36 {x}^{2} {y}^{2} }$
$5) \frac{(a + 1)^{2} - {(a - 1)}^{2} }{2a(a ^{2} - 1)} = \frac{(a + 1 + a - 1)(a + 1 - a + 1)}{2a( {a}^{2} - 1) } = \frac{4a }{2a( {a}^{2} - 1) } = \frac{2 }{ {a}^{2} - 1}$
$6) \frac{ - 36 + {x}^{2} - 6x + 36 }{x(x - 6)} = \frac{ {x}^{2} - 6x}{ {x}^{2} - 6x} = 1$
$8) \frac{ {y}^{2} - {z}^{2} }{ {(y - z)}^{2} } = \frac{y + z}{y - z}$
$9) \frac{x}{x - 5} - \frac{25}{x(x - 5)} = \frac{ {x}^{2} - 25 }{x(x - 5)} = \frac{x + 5}{x} = \frac{ - 1.4 + 5}{ - 1.4} = - \frac{18}{7}$