(х+3у) ^2(х+3у) (х-3у)

Ответ: (х+3у)^2(х+3у)(х-3у) = (х+3у)(х+3у)(х-3у) = (х^2+6ху+9у^2)(х-3у) = х^3-9ху^2+6ху^2-36у^3 = х^3-3ху^2-36у^3