Tìm \(a,b,c\) sao cho\(\begin{ali...

Câu hỏi: Tìm \(a,b,c\) sao cho\(\begin{align}& a)\frac{4x-7}{{{x}^{2}}-3x+2}=\frac{a}{x-1}+\frac{b}{x-2} \\  & b)\frac{{{x}^{2}}+5}{{{x}^{3}}-3x-2}=\frac{a}{x-2}+\frac{b}{{{(x+1)}^{2}}} \\ \end{align}\)

A \(\begin{array}{l}
a)\,\,\left\{ \begin{array}{l}
a = -3\\
b = 1
\end{array} \right.\\
b)\,\,\left\{ \begin{array}{l}
a = 1\\
b =  2
\end{array} \right.
\end{array}\)

B \(\begin{array}{l}
a)\,\,\left\{ \begin{array}{l}
a = -3\\
b = 1
\end{array} \right.\\
b)\,\,\left\{ \begin{array}{l}
a = 1\\
b = - 2
\end{array} \right.
\end{array}\)

C \(\begin{array}{l}
a)\,\,\left\{ \begin{array}{l}
a = 3\\
b = 1
\end{array} \right.\\
b)\,\,\left\{ \begin{array}{l}
a = 1\\
b = 2
\end{array} \right.
\end{array}\)

D \(\begin{array}{l}
a)\,\,\left\{ \begin{array}{l}
a = 3\\
b = 1
\end{array} \right.\\
b)\,\,\left\{ \begin{array}{l}
a = 1\\
b = - 2
\end{array} \right.
\end{array}\)