1) а) 2х^2=(2х-1)*(х+1)
2х^2=2х^2+2х-х-1
2х^2-2х^2+2х-х-1=0
х-1=0
х=1
б) (10х+14)*х-(5х-1)*(2х+3)=4
10х^2+14х-10х^2-15х+2х+3-4=0
х-1=0
х=1
2) а) (3х-5)*(х+2)=3х^2
3х^2+6х-5х-10-3х^2=0
х-10=0
х=10
б) (6х+2)*х-(2х-1)*(3х+2)=3
6х^2+2х-6х^2-4х+3х+2-3=0
х-1=0
х=1