5) 7x4y13 35x5y8 1ly2n; 18m²n³ 22m²n 9xm

5) $$\frac{7x^4y^{13}}{18m^2n^5} : \frac{35x^5y^8}{22m^4n^8} : \frac{11y^2n^9}{9xm^4} = \frac{7x^4y^{13}}{18m^2n^5} \cdot \frac{22m^4n^8}{35x^5y^8} \cdot \frac{9xm^4}{11y^2n^9} = \frac{7x^4y^{13} \cdot 22m^4n^8 \cdot 9xm^4}{18m^2n^5 \cdot 35x^5y^8 \cdot 11y^2n^9} = \frac{7 \cdot 2 \cdot 11 \cdot 9 \cdot m^8 \cdot x^5 \cdot y^{13} \cdot n^8}{18 \cdot 35 \cdot 11 \cdot m^2 \cdot x^5 \cdot y^{10} \cdot n^{14}} = \frac{1386m^8x^5y^{13}n^8}{6930m^2x^5y^{10}n^{14}} = \frac{m^6y^3}{5n^6}$$

Ответ: $$\frac{m^6y^3}{5n^6}$$