Question

Помогите пж решить!!!!!!!!!!!!!!!!!!!

Answer 1

$\frac{1}{k-1}+2k=\frac{1}{k-1}+\frac{2k}{1}=\frac{1+2k*(k-1)}{k-1} =\boxed{\frac{1+2k^{2}-2k }{k-1}}$