Bài 1: Thực hiện phép tính
a) [ \(\frac{1}{\left(2x-y\right)^2}\) + \(\frac{2}{4x^2-y^2}\) + \(\frac{1}{\left(2x+y\right)^2}\) ] : \(\frac{16x}{4x^2+4xy+y^2}\)
b) \(\frac{3}{3x+3}\) + \(\frac{10}{5-5x}\) + \(\frac{5x-1}{x^2-1}\)
c) A = ( x\(^4\) - x\(^2\) + 2x - 1) : ( x\(^2\) + x - 1) - ( x\(^2\) - x )