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1. \(\dfrac{4}{12xy}-\dfrac{11}{18xy}=\) [ \(-\frac {5}{18xy}\) | \(\frac {5}{xy}\) | \(xy\) | \(\frac {1}{xy}\) ];
2. \(\dfrac{3a-4b}{a}+\dfrac{8a^2+4b^2}{ab}=\) [ \(\frac {3b+8a}{b}\) | \(\frac {b}{a}\) | \(ab\) | \(\frac {1}{ab}\) ];
3. \(5-\dfrac{4m+5n}{n}=\) [ \(-\frac {4}{n}\) | \(\frac mn\) | \(-\frac {4m}{n}\) | \(\frac 1n\) ];
4. \(\dfrac{a^2+b^2}{2a-b}+2a+b=\) [ \(\frac {1}{a-b}\) | \(\frac {a}{b}\) | \(\frac{5a^2}{2a-b}\) | \( \frac{5}{2a-b}\) ].