Thực hiện phép tính :\(\begin{align} & a)\frac...

Câu hỏi: Thực hiện phép tính :\(\begin{align} & a)\frac{3x-4}{4{{x}^{2}}{{y}^{5}}}+\frac{9x+4}{4{{x}^{2}}{{y}^{5}}} \\& b)\frac{x+8}{x-1}-\frac{2x-1}{x-1}-\frac{6x+2}{x-1} \\ & c)\frac{5{{x}^{2}}}{5x-6}+\frac{{{x}^{2}}-1}{6-5x}-\frac{7+x-{{x}^{2}}}{5x-6} \\\end{align}\)

A \(\begin{array}{l}
a)\,\,\frac{3}{{x{y^5}}}\\
b)\,\, 7\\
c)\,\,x + 1
\end{array}\)

B \(\begin{array}{l}
a)\,\,\frac{3}{{x{y^5}}}\\
b)\,\, - 7\\
c)\,\,x + 1
\end{array}\)

C \(\begin{array}{l}
a)\,\,\frac{3}{{x{y^4}}}\\
b)\,\, - 7\\
c)\,\,x + 1
\end{array}\)

D \(\begin{array}{l}
a)\,\,\frac{3}{{x{y^5}}}\\
b)\,\,  7\\
c)\,\,x - 1
\end{array}\)