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=0,5
2) ((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