2,5+4х-4,5=8,54х=8,5-2,5+4,54х=10,5х=10,5 : 4х=2,625Проверка: 2,5 +4*2,625 -4,5=2,5+10,5-4,5=8,57,2+2х-6=401,2+2х=402х=40-1,22х=38,8х=38,8 : 2х=19,4Проверка:7,2 +2*19,4 -6=7,2+38,8-6=407,2х+2х-6=409,2х-6=409,2х=40+69,2х=46х=46 : 9,2х=460 : 92х=5Проверка:7,2*5+2*5-6=36+10-6=4025х+4х-4,5=8,529х-4,5=8,529х=8,5+4,529х=13х=13 : 29х=13/29Проверка:25 * 13/29 + 4 * 13/29 -4,5 = 25/1 * 13/29 + 4/1 * 13/,29 - 4,5==25*13/1*29 + 4*13/1*29 - 4,5=325/29+52/29 -4,5=377/29 - 4,5==13-4,5=8,5