Rút gọn các biểu thức sau
Rút gọn các biểu thức sau:
a) 2x(2x-1)^2 — 4x(x+ 3)(x-3)-4(x+1)^3
b) (x-y+z)^2-(y-z)^2 + 2xy-2xz
c) (x-2)^3-(x^3 +1)+6(x-1)^2
d) (x+1)^4 - 6(x+1)^2 - (x^2-2)(x^2+2)
e)(x+y-z)^2 + (x-y+z)^2 - 2(y-z)^2
f) (a+ b+ c)^2 +( a-b-c)^2 +(b-c-a)^2 + (c-a-b)^2.
a) 2x(2x-1)^2 — 4x(x+ 3)(x-3)-4(x+1)^3
b) (x-y+z)^2-(y-z)^2 + 2xy-2xz
c) (x-2)^3-(x^3 +1)+6(x-1)^2
d) (x+1)^4 - 6(x+1)^2 - (x^2-2)(x^2+2)
e)(x+y-z)^2 + (x-y+z)^2 - 2(y-z)^2
f) (a+ b+ c)^2 +( a-b-c)^2 +(b-c-a)^2 + (c-a-b)^2.