2 целых 2/3 : 1 целая 7/9=1/5:(x-0,6)

1 способ.2 2/3 : 1 7/9 = 1/5 : (х - 0,6)8/3 : 16/9 = 1/5 : (х - 0,6)8/3 * 9/16 = 1/5 : (х - 0,6)3/2 = 1/5 : (х - 0,6)х - 0,6 = 1/5 : 3/2х - 6/10 = 1/5 * 2/3х - 3/5 = 2/15х = 2/15 + 3/5 = 2/15 + 9/15 = 11/15х = 11/152 способ.2 2/3 : 1 7/9 = 1/5 : (х - 0,6) - это пропорция8/3 * (х - 0,6) = 16/9 * 1/5 - свойство пропорции8/3х - 8/3 * 3/5 = 16/458/3х - 8/5 = 16/458/3х = 16/45 + 8/5 = 16/45 + 72/45 = 88/458/3х = 88/45х = 88/45 : 8/3 = 88/45 * 3/8 = (11*1)/(15*1) = 11/15х = 11/15