Question

Помогите. Пожалуйста!

Answer 1

$(z - \frac{5z}{z + 3} ) \div \frac{z - 2}{z + 3} = \\ \frac{ {z}^{2} + 3z - 5z }{z + 3} \times \frac{z + 3}{z - 2} = \\ = \frac{z(z- 2)}{z + 3} \times \frac{z + 3}{z - 2} = z$