Найду корень уравнения: 1,3:3,9=x:0,6
13 x ----- = --- 39 3/5 10*-- 10
(13/10)/(39/10) = x/(3/5)
13/1039/10 = x/(3/5)
13/1039/10 = x/3/5
x = -1/3 / (-5/3)
x1 = 1/5
x1 = 0.2