1)(m^2 - n) ( m+n^2)
m^2 m+m^2 n^2 -nm+nn^2
m^3 +m^2 n^2 -mn - n^3
2)(m^2 - n) (m-n^2)
m^2 m - m^2 n^2 -nm - n * (-n)^2
m^3 - m^2 n^2 -mn +n^3
3)(m-n+1)(m+n)
m^2 + mn - mn - n^2 +m +n
m^2 - n^2 +m+n
4)(m-2n)(m+2n-1)
m^2 +2mn-m-2mn-4n^2 +2n
m^2 -m - 4n^2 +2n
5)b(3b+1)(2b-5)
(3b^2 +b)* ( 2b-5)
6b^3 -15b^2 + 2b^2 - 5b
6b^3 -13b^2 -5b
6)5m(m-n)(m+3n)
(5m^2 - 5mn) (m+3n)
5m^3 + 15m^2 n - 5m^2 n-15mn^2
5m^3 +10m^2 n - 15mn^2