1) (x-2) (x-1) -x во 2 степени = 5x во 2 степени, запишу вот так х^2х^2 - х - 2х + 2 - х^2 = 5х^2 - х^2 - 2х - х = 5 - 2-3х = 3- х = 3:3- х = 1х = - 13) (3x+2) (x-1) - 3 (x+1) (x-2) = 43х^2 - 3х + 2х - 2 -3(х^2 - 2х + х - 2) = 43х^2 - 3х + 2х - 2 -3х^2 + 6х - 3х + 6 = 43х^2 -3х^2 + 6х - 3х - 3х + 2х = 4 + 2 - 62х = 0х = 0 : 2х = 04) 2 (x+3) (x-4) = (2x - 1 ) (x+2) - 272(х^2 + 4х - 3х +12) = 2х^2 + 4х - х - 2 - 272х^2 + 8х - 6х + 24 = 2х^2 + 4х - х - 2 - 272х^2 - 2х^2 + 8х + х - 4х - 6х = - 24 - 2 - 279х - 10х = - 26 - 27- х = - 53х = 532) (х + 2)(х + 3) = х^2 - 7х ^2 - 3х + 2х - 6 = х^2 - 7х^2 - х^2 - 3х + 2х = -7 + 6- х = - 1х = 1