Упростите выражение (2x+3y^3)^2-12xy^3
(2Х+3у^3)^2-12ху^3=4х^2+12ху^3+9у^3-12ху^3 =4х^2+9у^3
=4х^2+12ху^3+9у^6-12ху^3=4х^2+9у^6