a) (c-2)(c+3)-(c-1)^2(c^2 + 3c - 2c - 6) - (c^2 - 2c + 1)(c^2 + c - 6) - c^2 + 2c - 1c - 7
б) 3(a+c)^2 - 6ac3(a^2 + 2ac + c^2) - 6ac3a^2 + 6ac + 3c^2 - 6ac3a^2 + 3c^2
a) (c-2)(c+3)-(c-1)^2
(c^2 + 3c - 2c - 6) - (c^2 - 2c + 1)
(c^2 + c - 6) - c^2 + 2c - 1
c - 7
б) 3(a+c)^2 - 6ac
3(a^2 + 2ac + c^2) - 6ac
3a^2 + 6ac + 3c^2 - 6ac
3a^2 + 3c^2