УПРОСТИТЕ-0,4а(2а^2+3)(5-3a^2)

Question

УПРОСТИТЕ
-0,4а(2а^2+3)(5-3a^2)

Answer 1

-0,4а(2а^2+3)(5-3a^2)=-0,4(10а²-6а²+15-9а²)= -4а³+2,4а³-6а+3,6а³=2а³-6а