Question

помогите,пожалуйста​

Answer 1

1.

$\frac{a + 2}{2 {a}^{3} } - \frac{a + 5}{4 {a}^{2} } = \frac{2a + 4 - {a + 5a}^{2} }{4 {a}^{ 3} } = \frac{5 {a}^{2} + a + 4}{4 {a}^{3} }$

2.

$\frac{x + 5}{ {x}^{7} } + \frac{4}{5x} = \frac{5x + 25 + 4 {x}^{6} }{ 5{x}^{7} }$

3.

$\frac{t + 2}{12t} - \frac{2t + 3}{24t} = \frac{2t + 4 - 2t - 3}{24t} = \frac{1}{24t}$

4.

$\frac{k + 2}{7k} - \frac{2n - 1}{14n} = \frac{2kn + 4n - 2kn + k}{14kn} = \frac{4n + k}{14kn}$