Tính: a. (x^2 - 1)^3 - (x^4 + x^2 + 1)(x^2 - 1); b. (x^4 - 3x^2 + 9)(x + 3) - (3 + x^2)^2; c. (x - 3)^3 - (x - 3)(x^2 + 3x + 9) + 5(x + 1)^2

Bài 1
a. (x^2-1)^3-(x^4+x^2+1)(x^2-1)
b. x^4-3x^2+9)(x+3)-(3+x^2)^2
c. (x-3)^3-(x-3)(x^2+3x+9)+5(x+1)^2
Bài 2
a.(x+2)(x^2-2x+1)-x(x^2+2)=15
b.(x+3)^3-x(3x+1)+(2x+1)(4x^2-2x+1=20
c.(x^2-1)^3-(x^4+x+1)(x^2-1)=0