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1. \(\dfrac{a+2}{2a^3}-\dfrac{a+5}{4a^2}=\) [ \(\frac{a^2+4}{4a^2}\) | \(\frac{a-4}{2a^3}\) | \(\frac{-a^2-3a+4}{4a^3}\) | \(\frac{4a^3}{a^2-4}\) ]
2. \(\dfrac{x+5}{x^7}+\dfrac{12}{15x}=\) [ \(\frac{4x^6+5x+25}{5x^7}\) | \(\frac{x^6-1}{x^6}\) | \(\frac{x^6+1}{x^6}\) | \(\frac{x^6-1}{x^7}\) ]
3. \(\dfrac{t+2}{12t}-\dfrac{2t+3}{24t}=\) [ \(\frac{24}{t}\) | \(\frac{1}{24t}\) | \(\frac{12}{t}\) | \(\frac{1}{12t}\) ]
4. \(\dfrac{k+2}{7k}-\dfrac{2n-1}{14n}=\) [ \(\frac{14n+k}{4kn}\) | \(\frac{4n+k}{14kn}\) | \(\frac{n+4k}{14kn}\) | \(\frac{n+14k}{4}\) ]