4целых 2/3 * 6 целых - 1 целая 23/42 * 3 целых 1/13 + 2 целых 1/8 * 1 целая 29/51 =

1)4 2/3*6 =24 12/3=28
2)1 23/42*3 1/13=65/42*40/13=100/21=4 16/21
3)2 1/8*1 29/51=17/8*80/51=10/3=3 1/3
4)6-4 16/21=1 5/21
5)1 5/21 +3 1/3=1 5/21+3 7/21=8 12/21=8 4/7