First question, I doubt that the m in your first bracket is a cube.

Question 2, Question 1: (x 2-2x) (x 2-2x-3)

x(x-2)(x^-2x+ 1-4)

x(x-2)(x+ 1)(x-3)

The second question: ~ ~ = x-6x 2y+6xy 2-y 3

Question 3: ~ = (x 3)-3 3

=x^6-27

Question 4: ~= ~×(2- 1)

(2^2- 1)(2^4- 1)……

(2^4- 1)(2^8- 1)…

…

2^ 16- 1

Question 3: ~ = (A+B) 2-C 2+C 2-(A+B 2)

=4ab

I can't. I'm tired of typing. ...

By the way, I'm also doing the first problem of improving cohesion ~