Question

[Jimin]

thuc hien phep tinh :

a, (x+1)(1+x-x^2+x^3-x^4)-(x-1)(1+x+x^2+x^3+x^4)

b, (2b^2-2-5b+6b^3)(3+3b^2-b)

Answer 1

[Nguyễn Trúc Mai]