Rút gọn

Bài1Rút gọn a/(x-3)2 – (2x +1)2 +3(x-1)(x+1)    b/(a-2)(a+2)(a2+4)–(a2+1)(a2-1)      

                               c/(x- 3)3+(x+1)3 -2(x-1)(x2+x+1)     d/(x+2)(x-2)(x2+2x+4)(x2-2x +4)   

                               e/(x-y)(x+y)(x2+y2)…(x64+y64).        f/4(32+1)(32-1)…(3128+1)