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1. \(\dfrac{18a^9b^7}{12a^{11}b^5}=\) [ \(\frac{3b}{2a}\) | \(\frac{3b^2}{2a^2}\) | \(\frac{9b}{6a}\) | \(\frac{9b^2}{6a^2}\) ];

2. \(\dfrac{m^2+10m+25}{25-m^2}=\) [ \(1\) | \(\frac{m+5}{5-m}\) | \(\frac{m+5}{m-5}\) | \(m+5\) ];

3. \(\dfrac{x^3-27}{x^2-5xy-3x+15y}=\) [ \(\frac{x^2+3x+9}{x-5y}\) | \(\frac{x-3}{x-5y}\) | \(\frac{x^2+3x+9}{x+5y}\) | \(\frac{x^2+6x+9}{x-5y}\) ].