Đề bài

Tính:

a) $({x^2} - 2x + 1):(x - 1)$;                                               

b) $({x^3} + 2{x^2} + x):({x^2} + x)$;

c) $( - 16{x^4} + 1):( - 4{x^2} + 1)$;                                                                       

d) $( - 32{x^5} + 1):( - 2x + 1)$.