х - ( 3х + 5 ) + ( 2х - 4 ) = х - 3х - 5 + 2х - 4 = -9 ( 3а² - 4b + 5 ) + ( 2b - a² - 1 ) = 3a² - 4b + 5 + 2b - a² - 1 = 2a² - 2b + 4 = 2 ( а² - b + 2 )
б) ( 3а² - 4b + 5 ) + ( 2b - a² - 1 ) = 3a² - 4b + 5 + 2b - a² - 1 = 2a² - 2b + 4 = 2 ( а² - b + 2 ).
Удачи
х - ( 3х + 5 ) + ( 2х - 4 ) = х - 3х - 5 + 2х - 4 = -9 ( 3а² - 4b + 5 ) + ( 2b - a² - 1 ) = 3a² - 4b + 5 + 2b - a² - 1 = 2a² - 2b + 4 = 2 ( а² - b + 2 )