Question

RÚT GỌN:

Answer 1

a: \(=\dfrac{x^2-2xy+y^2}{x-y}=x-y\)

b: \(=\dfrac{5x-7+9-3x}{2\left(x-1\right)}-\dfrac{4x}{\left(x-1\right)\left(x+1\right)}\)

\(=\dfrac{2x+2}{2\left(x-1\right)}-\dfrac{4x}{\left(x-1\right)\left(x+1\right)}=\dfrac{x+1}{x-1}-\dfrac{4x}{\left(x-1\right)\left(x+1\right)}\)

\(=\dfrac{x^2+2x+1-4x}{\left(x-1\right)\left(x+1\right)}=\dfrac{\left(x-1\right)^2}{\left(x-1\right)\left(x+1\right)}=\dfrac{x-1}{x+1}\)