Решите 0,9*(1 5/9-4/9: (5/8 + 3/8: 3) )

0,9*(1 5/9-4/9:(5/8+3/8:3))=0,9*(1 5/9 - 4/9 :(5/8 + 1/8))=0,9*(1 5/9 - 4/9 :6/8)=0,9*(1 5/9 - 16/27)=0,9*(1 15/27 - 16/27)=0,9*26/27=9/10 * 26/27=1/5 * 13/3=13/15