P = 100^2 - 99^2 + 98^2 - 97^ 2… +2^2 - 1; D = (x - y)^100 + (y - z)^100 biết x^2 + y^2 + z^2 = xy + yz + 2x

a) P = 100^2 - 99^2 + 98^2 - 97^ 2… +2^2 - 1
b) D = (x - y)^100 + (y - z)^100 biết x^2 + y^2 + z^2 = xy + yz + 2x
c) Tìm x:
(x-1)(x^2+x+1)=(x-2)^3-3x(2x+1)