(12 - d)*(12 + d)
(12 - d)*(12 + d) при d = -1
(12 - (-1))*(12 + (-1))
(12 - (-1))*(12 - 1)
143
(12.0 + d)*(12.0 - d)
2 144 - d
-(-12 + d)*(12 + d)