Question

Решите данные примеры​

Answer 1

Пошаговое объяснение:

$\frac{ {a \times (a + 4)}}{4 {a}^{2} } - \frac{4 \times (a - 2)}{4 {a}^{2} } = \\ \frac{ {a}^{2} + 4a - 4a + 8 }{4 {a}^{2} } = \frac{ {a}^{2} + 8 }{4 {a}^{2} }$

$\frac{3x(x - 3) + 3x(x + 3)}{(x + 3)(x - 3)} = \\ \frac{3 {x}^{2} - 9x + 3 {x}^{2} + 9x }{ {x}^{2} - 9} = \frac{6 {x}^{2} }{ {x}^{2} - 9}$

$\frac{12 {x}^{3} \times 5}{25 \times 4 {x}^{4} } = \frac{3 {x}^{3} }{5 {x}^{4} } = \frac{3}{5x}$