Найдите неизвестный член пропорции:
(2+1/9) : (6+1/3) =х : 1,8 x=(2+1/9) * 1,8 / (6+1/3) = (19/9) * 9/5 / (19/3) = (19/1) * 1/5 / (19/3) = (1/1) * 1/5 / (1/3) = 3/5 = 0,6
2 1/9 : 6 1/3=x:1,8 2 1/9= 19/9 6 1/3=19/3 1,8=9/5 x=19/9 * 9/5 *3/19=3/5