[tex]\displaystyle 1)-\frac{a^2}{12b}:\frac{ab}{36}=-\frac{a^2}{12b}*\frac{36}{ab}=-\frac{a}{b}*\frac{3}{b}=-\frac{3a}{b^2}\\ \\2)-\frac{9y^2}{20x^3}:\frac{y^5}{16x}=-\frac{9y^2}{20x^3}*\frac{16x}{y^5}=-\frac{9}{5x^2}*\frac{4}{y^3}=-\frac{36}{5x^2y^3} \\ \\3)\frac{18a^2b^2}{5cd}:(-\frac{9ab^3}{5c^2d^4})=-\frac{18a^2b^2}{5cd}*\frac{5c^2d^4}{9ab^3}=-2a*\frac{cd^3}{b}=-\frac{2acd^3}{b}[/tex]
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[tex]\displaystyle 1)-\frac{a^2}{12b}:\frac{ab}{36}=-\frac{a^2}{12b}*\frac{36}{ab}=-\frac{a}{b}*\frac{3}{b}=-\frac{3a}{b^2}\\ \\2)-\frac{9y^2}{20x^3}:\frac{y^5}{16x}=-\frac{9y^2}{20x^3}*\frac{16x}{y^5}=-\frac{9}{5x^2}*\frac{4}{y^3}=-\frac{36}{5x^2y^3} \\ \\3)\frac{18a^2b^2}{5cd}:(-\frac{9ab^3}{5c^2d^4})=-\frac{18a^2b^2}{5cd}*\frac{5c^2d^4}{9ab^3}=-2a*\frac{cd^3}{b}=-\frac{2acd^3}{b}[/tex]