Thực hiện phép tính:a) \(\left( {{x^3} + {x^2} - 3...

Câu hỏi: Thực hiện phép tính:a) $\left( {{x^3} + {x^2} - 3x + 9} \right):\left( {x + 3} \right)$b) $\frac{{4x - 8}}{{x + 5}}:\frac{{25 - {x^2}}}{{2x - {x^2}}}$

A $\begin{array}{l}a)\,\,{x^2} - 2x + 3\\b)\,\,\frac{{4x{{\left( {x - 2} \right)}^2}}}{{{{\left( {x + 5} \right)}^2}\left( {x - 5} \right)}}\end{array}$

B $\begin{array}{l}a)\,\,{x^2} - 2x - 3\\b)\,\,\frac{{4x{{\left( {x - 2} \right)}^2}}}{{{{\left( {x - 5} \right)}^2}\left( {x + 5} \right)}}\end{array}$

C $\begin{array}{l}a)\,\,{x^2} - 2x + 3\\b)\,\,\frac{{4x{{\left( {x - 2} \right)}^2}}}{{{{\left( {x + 5} \right)}^2}\left( {5 - x} \right)}}\end{array}$

D $\begin{array}{l}a)\,\,{x^2} - 2x - 3\\b)\,\,\frac{{4x{{\left( {x - 2} \right)}^2}}}{{{{\left( {x - 5} \right)}^2}\left( {x + 5} \right)}}\end{array}$