Найдите значение выражения: 1) 15 4/9 - 4 4/9 * 3

1) 15 4/9 - 4 4/9 * 3 3/8=15 4/9 - 40/9 * 27/8=15 4/9 - 5/1 * 3/1=15 4/9-15=4/9;
2) 81/88 * (6 - 1 13/15 * 1 19/21)=81/88 * (6-28/15 * 40/21)=81/88 * (6-32/9)=
81/88 * (6-3 5/9)=81/88 * 2 4/9=81/88 * 22/9=9/4 * 1/1=9/4=2 1/4;
3) (5 1/16 - 1 1/8)(5/6 + 3/14)=(4 1/16-2/16)((35+9)/42)=(3 17/16-2/16) * 44/42=
3 15/16 * 22/21=63/16 * 22/21=3/8 * 11/1=33/8=4 1/8;
4) 5 1/16 - 1 1/8 * (5/6 + 3/14)=5 1/16 - 9/8 * 22/21=5 1/16 - 3/4 * 11/7=5 1/6-33/28=
5 1/16-1 5/28=4 1/16-5/28=4 7/112-20/112=3 (119-20)/112=3 99/112.