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 ~