a) (2a^2 - b)(b - 2a^2)= 2a^2 b - 2a^2 2a^2 - b b + b 2a^2= 2a^2b - 4a^4 - b^2 + 2ab
г) (-c^2 - 2d)(c^2 + 2d)= -c^2 c^2 - c^2 2d - 2d c^2 - 2d 2d= -c^4 - 2c^2d - 2c^2d - 4d^2= -c^4 - 4c^2d - 4d^2
a) (2a^2 - b)(b - 2a^2)
= 2a^2 b - 2a^2 2a^2 - b b + b 2a^2
= 2a^2b - 4a^4 - b^2 + 2ab
г) (-c^2 - 2d)(c^2 + 2d)
= -c^2 c^2 - c^2 2d - 2d c^2 - 2d 2d
= -c^4 - 2c^2d - 2c^2d - 4d^2
= -c^4 - 4c^2d - 4d^2