2) 16x2ys 6x3y8; 15m² 35m²)

2) $$\frac{16x^2y^5}{15m^4n^7} : (-\frac{6x^3y^8}{35m^6n^4}) = \frac{16x^2y^5}{15m^4n^7} \cdot (-\frac{35m^6n^4}{6x^3y^8}) = - \frac{16x^2y^5 \cdot 35m^6n^4}{15m^4n^7 \cdot 6x^3y^8} = - \frac{16 \cdot 7 \cdot 5 \cdot x^2 \cdot y^5 \cdot m^6 \cdot n^4}{3 \cdot 5 \cdot m^4 \cdot n^7 \cdot 6 \cdot x^3 \cdot y^8} = - \frac{112m^2}{18xyn^3} = - \frac{56m^2}{9xyn^3}$$

Ответ: $$- \frac{56m^2}{9xyn^3}$$