1) (7-2x-x^2) - (x-2)(x+3)= 2) (3m^2+3n^2) - (2m+n)(m+2n)= 3) (z+2)(z+3)-z(z+1)= 4)

Раскроем скобки и упростим выражения:

1) (7 - 2х - х^2) - (х -2) * (х + 3) = 7 - 2х - х^2 - (х^2 + 3х - 2х - 6) = 7 - 2х - х^2 - х^2 - 3х + 2х + 6 = -2х^2 - 3х + 13;

2) (3m^2 + 3n^2) - (2m + n) * (m + 2n) = 3m^2 + 3n^2 - (2m^2 + 4mn + mn + 2n^2) = 3m^2 + 3n^2 - 2m^2 - 4mn - mn - 2n^2 = m^2 - 5mn + n^2;

3) (z + 2) * (z + 3) - z * (z + 1) = z^2 + 3z + 2z + 6 - z^2 - z = 4z + 6;

4) (c - 5) * (c - 10) + 3c * (c + 5) = c^2 - 10c - 5c + 50 + 3c^2 + 15c = 4c^2 + 50;

5) u * (u + v) - (v - 1) * (u - 1) = u^2 + uv - uv + v + u - 1 = u^2 + v + u - 1.