Question

Answer 1

a:=(2x+2y)/(x+y)=2

b: \(=\dfrac{x^2-x+3x+1}{\left(x+1\right)\left(x-1\right)}=\dfrac{\left(x+1\right)^2}{\left(x+1\right)\left(x-1\right)}=\dfrac{x+1}{x-1}\)