1) ( (х-1)·(2х-1)+(х+1)·(2х+1))/((2х+1)·(2х-1))=(8х-1)/(4х²-1), ( 2х²-х-2х+1+2х²+х+2х+1)/(4х²-1)=(8х-1)/(4х²-1), 4х²-1≠0 4х²+2=8х-1, 4х²+2-8х+1=0, 4х²-8х+3=0, D=64-48=16, х1=(8+√16)/8=1,5 х2=(8-√16)/8=0,52) ((х+2)·(4х+1)+(х-2)·(4х-1))/((4х-1)(4х+1))=(6х+3)/(16х²-1), 16х²-1≠0, 4х²+х+8х+2+4х²-х-8х+2=6х+3, 8х²-6х+1=0, D=36-32=4, х1=(6+√4)/2·8=6+2/16=0,5, х2=(6-√4)/16=0,25