Answer:

1. -64x³+96x²-48x+8
2. a³+6a²b+9ab²+2b³
3. 8m³-36m²n+54mn²-27n³

Step-by-step explanation:

1. (2-4x)³

(2-4x)(2-4x)(2-4x)

(16x²-16x+4)(2-4x)

=-64x³+96x²-48x+8

2.(a+2b)³

(a+2b)(a+2b)(a+2b)

(a²+4ab+b²)(a+2b)

=a³+6a²b+9ab²+2b³

3.(2m - 3n)³

(2m - 3n)(2m - 3n)(2m - 3n)

(4m²-12mn+9n²)(2m - 3n)

=8m³-36m²n+54mn²-27n³