(3-х)(9+3х+х²)-2х+х³=27-x³-2x+x³=27-2x
(3-х)(9+3х+х²) - 2х+х³ =
= 27 + 9х + 3х² - 9х - 3х² - х³ - 2х + х³ =
= 27 - 2х
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(3-х)(9+3х+х²)-2х+х³=27-x³-2x+x³=27-2x
(3-х)(9+3х+х²) - 2х+х³ =
= 27 + 9х + 3х² - 9х - 3х² - х³ - 2х + х³ =
= 27 - 2х