Умоляю, помогите Буду очень благодарна!

1.
а)
$\frac{5x}{2} \times \frac{6}{ {x}^{2} } = 5 \times \frac{3}{x} = \frac{15}{x}$
б)
$(x - 1) \times \frac{2x + 1}{3x - 3} = (x - 1) \times \frac{2x + 1}{3(x - 1)} = \frac{2x + 1}{3}$
в)
$\frac{3x + 6}{x - 3} \times \frac{4x - 12}{ {x}^{2} - 4 = } = \frac{3(x + 2)}{x - 3} \times \frac{4(x - 3)}{(x - 2) \times (x + 2)} = 3 \times \frac{4}{x - 2} = \frac{12}{x - 2}$