1)26 целых 1/11-5,7= 2)40,8+15 целых 2/3= 3)18 целых 5/13-9.5= 4)0,6:9/25= 5)8/21:0,5=

1) 26 1/11 - 5,7 = 26 + 1/11 - 5 - 7/10 = (1/110 - 77/110) + 26 - 5 =

= - 76/110 + 21 = 21 - 38/55 = 20 17/55;

2) 40,8 + 15 2/3 = 40 + 8/10 + 15 + 2/3 = 55 + (24/30 + 20/30) =

= 55 + 44/30 = 55 + (1 + 14/30) = 56 14/30;

3) 18 5/13 - 9,5 = 18 + 5/13 - 9 - 5/10 = 9 + (50/130 - 65/130) = 9 - 15/130 =

= 9 - 3/26 = 8 23/26;

4) 0,6 : 9/25 = 6/10 * 25/9 = 6/9 * 25/10 = 2/3 * 5/2 = 10/6 = 5/3 = 1 2/3;

5) 8/21 : 0,5 = 8/21 : 5/10 = 8/21 * 5/2 = 16/21;

6) 3,5 : 4 2/3 = 35/10 : (4 * 3 + 2)/3 = 7/2 : 14/3 = 7/14 * 3/2 = 3/4.