Tính: 4x^2 + 3y^2.2^2 - 12xyz; 36x^2 - 24xy + 16y^2

Tính:
a, 4x^2 + 3y^2.2^2 - 12xyz
b, 36x^2 - 24xy + 16y^2
c, 25x^4 - 4x^2 + 50x^2 - 20x + 25
d, ( x . √3/2 ) ( x + √3/2 ) + x^3 + x^2 - x - 1/x^2 - 1