Question

[Duong Thi Nhuong]

TÌm a,b,c : \(\frac{a}{x}+\frac{b}{x-1}+\frac{c}{x-2}=\frac{9x^2-16x+4}{x^3-3x^2+2x}\)

Answer 1

[Bùi Hà Chi]

\(\frac{a}{x}+\frac{b}{x-1}+\frac{c}{x-2}=\frac{9x^2-16x+4}{x^3-3x^2+2x}\)

\(\Leftrightarrow\frac{\left(x-2\right)\left(x-1\right)a}{\left(x-2\right)\left(x-1\right)x}+\frac{\left(x-2\right)xb}{\left(x-2\right)\left(x-1\right)x}+\frac{\left(x-1\right)xc}{\left(x-2\right)\left(x-1\right)x}=\frac{9x^2-16x+4}{x^3-3x^2+2}\)

\(\Leftrightarrow\frac{\left(x-2\right)\left(x-1\right)a+\left(x-2\right)xb+\left(x-1\right)xc}{\left(x-2\right)\left(x-1\right)x}=\frac{9x^2-16x+4}{x^3-3x^2+2}\)

\(\Leftrightarrow\frac{a\left(x^2-3x+2\right)+b\left(x^2-2x\right)+c\left(x^2-x\right)}{x^3-3x^2+2}=\frac{9x^2-16x+4}{x^3-3x^2+2}\)

\(\Leftrightarrow\frac{x^2\left(a+b+c\right)-x\left(3a+2b+c\right)+2a}{x^3-3x^2+2}=\frac{9x^2-16x+4}{x^3-3x^2+2}\)

Sử dụng đồng nhất thức ta được: \(\begin{cases}x^2\left(a+b+c\right)=9\\x\left(3a+2b+c\right)=16\\2a=4\end{cases}\)\(\Leftrightarrow\begin{cases}a=2\\b=3\\c=4\end{cases}\)