Tính:

\(a,\dfrac{2x^2-1}{x-1}+\dfrac{x+1}{1-x}+\dfrac{2-x^2}{x-1}\)

\(b,\dfrac{x+3}{x^2-1}-\dfrac{x+1}{x^2-x}\)

Tính:

\(a,\dfrac{-5}{4+2y}+\dfrac{y-2}{2y+y^2}\)

\(b,\dfrac{x-1}{x^2-2xy}+\dfrac{3}{2xy-x^2}\)

Tính:

\(a,\dfrac{6}{x^2+4x}+\dfrac{3}{2x+8}\)

\(b,\dfrac{3-2x}{x^2-9}+\dfrac{1}{2x-6}\)

Rút gọn phân thức:

\(a,\dfrac{3\left(x-y\right)}{y-x}\)

\(b,\dfrac{x^2-x}{1-x}\)

Rút gọn phân thức:

\(a,\dfrac{x^2+2x+1}{5x^3+5x^2}\)

\(b,\dfrac{2x^2+2x}{x+1}\)