4 1/2:x+1 3/4=3 19/28 плиз
1/2:Х+1 3/4=3 19/28 1/2÷х+1 3/4=3 19/28 1/2х+7/4=103/28 1/2х=103/28-7/4 1/2х=27/14 14=54х 54х=14 х=7/27