А2 - 1
-3х^3(-2х^3а+4а-3х)= 6х^6а - 12х^3а +9х^4
А3 - 2
х^2(4-у^2)-у^2(9-х^2)=
4х^2-х^2у^2-9у^2+х^2у^2=
= 4х^2 - 9у^2
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Answers & Comments
А2 - 1
-3х^3(-2х^3а+4а-3х)= 6х^6а - 12х^3а +9х^4
А3 - 2
х^2(4-у^2)-у^2(9-х^2)=
4х^2-х^2у^2-9у^2+х^2у^2=
= 4х^2 - 9у^2